How long will it take a car to reach a top speed of 203 mph if its accelerating at an average of 2. 93ft/s² up a ramp with a slope of 6. 4%? And how far will it have travelled in feet before it reaches its top speed?

using partial fractions we can get the result of the integral l ∫ (9x^2 + 6x + 10) / (3x + 1)^3 dx as ∫ (1/3)(3x + 1)^-3 dx

To evaluate the integral ∫ (9x^2 + 6x + 10) / (3x + 1)^3 dx, we can use the method of partial fractions.

Let's start by factoring the denominator:

(3x + 1)^3 = (3x + 1)(3x + 1)(3x + 1) = (3x + 1)^2(3x + 1)

We can rewrite the integral as:

∫ (9x^2 + 6x + 10) / (3x + 1)^3 dx = ∫ A/(3x + 1) + B/(3x + 1)^2 + C/(3x + 1)^3 dx

Now, we need to find the values of A, B, and C.

To determine A, we can multiply the entire equation by (3x + 1) and substitute x = -1/3:

9x^2 + 6x + 10 = A + B(3x + 1) + C(3x + 1)^2

Substituting x = -1/3:

9(-1/3)^2 + 6(-1/3) + 10 = A + B(-1 + 1/3) + C(-1 + 1/3)^2

Simplifying:

1/3 - 2 + 10 = A - B/3 + C/9

1/3 + 8 = A - B/3 + C/9

25/3 = A - B/3 + C/9

To determine B, we can differentiate the equation and substitute x = -1/3:

(9x^2 + 6x + 10)' = (A + B(3x + 1) + C(3x + 1)^2)'

18x + 6 = B + 2C(3x + 1)

Substituting x = -1/3:

18(-1/3) + 6 = B + 2C(-1 + 1/3)

-6 + 6 = B - 2C/3

B - 2C/3 = 0

To determine C, we can differentiate the equation again and substitute x = -1/3:

(18x + 6)' = (B + 2C(3x + 1))'

18 = 2C

Now we have the values of A = 25/3, B = 2C/3, and C = 9.

Substituting these values back into the integral:

∫ (9x^2 + 6x + 10) / (3x + 1)^3 dx = ∫ 25/3/(3x + 1) + 2C/3/(3x + 1)^2 + 9/(3x + 1)^3 dx

Simplifying the integral:

∫ 25/9(3x + 1)^-1 + 2/9(3x + 1)^-2 + (1/3)(3x + 1)^-3 dx

Now we can integrate each term separately:

∫ 25/9(3x + 1)^-1 dx = (25/9)ln|3x + 1| + K1

∫ 2/9(3x + 1)^-2 dx = -2/9(3x + 1)^-1 + K2

∫ (1/3)(3x + 1)^-3 dx

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The partial derivative of z with respect to t, dz/dt, can be found using the chain rule. Substituting the given expressions for x(t), y(t), and dz/dt into the chain rule formula, we can calculate the value of [tex]dz/dt[/tex] as [tex]-22 sin(t) cos(t)[/tex].

To find dz/dt, we need to use the chain rule. Given [tex]z(x, y) = x^2 - y^2, x(t) = 11[/tex][tex]sin(t)[/tex], and[tex]y(t) = 5 cos(t)[/tex], we can express z as [tex]z(t) = x(t)^2 - y(t)^2[/tex].

Applying the chain rule, we have:

[tex]dz/dt = (dz/dx) * (dx/dt) + (dz/dy) * (dy/dt)[/tex]

First, we find the partial derivatives dz/dx and dz/dy:

[tex]dz/dx = 2x[/tex]

[tex]dz/dy = -2y[/tex]

Next, we substitute the expressions for x(t) and y(t) into these partial derivatives:

[tex]dz/dx = 2(11 sin(t)) = 22 sin(t)[/tex]

[tex]dz/dy = -2(5 cos(t)) = -10 cos(t)[/tex]

Now, we substitute these derivatives and the expressions for dx/dt and dy/dt into the chain rule formula:

[tex]dz/dt = (22 sin(t)) * (11 cos(t)) + (-10 cos(t)) * (-5 sin(t))[/tex]

[tex]= 242 sin(t) cos(t) + 50 sin(t) cos(t)[/tex]

[tex]= (242 + 50) sin(t) cos(t)[/tex]

[tex]= 292 sin(t) cos(t)[/tex]

Simplifying further, we have:

[tex]dz/dt = 22(2 sin(t) cos(t))[/tex]

[tex]= -22 sin(2t)[/tex]

Therefore, [tex]dz/dt[/tex]is equal to[tex]-22 sin(2t)[/tex].

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The correct implications of the Tukey test are the following:

a. Population mean sales based on p2 is lower than population mean sales based on p1.

c. Population mean sales based on P3 is the highest.

d. There are two distinct groups.

The Tukey test, also known as the Tukey HSD (Honestly Significant Difference) test, is a post-hoc test utilized to determine significant differences between groups in a one-way ANOVA. It compares all possible pairs of means to figure out if any are statistically different from each other. It compares means, not variances, to establish if there are differences in the population means.

The following is the Tukey outputs and the comparison among the three promotions:

p2-p1 = 16.8809524,

p3-p1 = 0.6031746,

p3-p2 = -16.2777778

p2-p1 16.8809524 12.868217 20.893688 0.0000000

p3-p1 0.6031746 -3.031648 4.237997 0.9071553

p3-p2 -16.2777778 - 20.079166 -12.476390. 0.0000000.

This table indicates that the population mean sales based on p2 is lower than population mean sales based on p1. The same table indicates that the population mean sales based on p3 is the highest. The third implication is that there are two distinct groups, as is evident from the large differences between p2-p1 and p3-p2.

This option is also correct. Therefore, options a, c, and d are the correct statement of the implications of the Tukey test.

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The objective function is represented by option A) Minimize 700 x1 + 465 x2 + 305 x3.

In optimization problems, the objective function defines the quantity that needs to be minimized or maximized. The objective function typically includes variables that represent the decision variables of the problem.

Among the given options, option A) Minimize 700 x1 + 465 x2 + 305 x3 explicitly states a minimization objective. This means that the goal is to minimize the value of the expression 700 x1 + 465 x2 + 305 x3.

On the other hand, options B), C), and D) do not specify whether the objective is to minimize or maximize the respective expressions. Thus, they do not represent the objective function.

Therefore, the correct representation of the objective function is option A) Minimize 700 x1 + 465 x2 + 305 x3.

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To form a committee of 24 members from a group of 26 individuals, we need to calculate the number of ways in which the committee can be created. Since the order in which the members are chosen does not matter, we need to consider combinations.

To determine the number of ways to form the committee, we can use the concept of combinations. The number of combinations is calculated using the formula C(n, r) = n! / (r! * (n-r)!), where n is the total number of individuals and r is the number of members in the committee.

In this case, we have 26 individuals vying for a position in the committee, and we want to form a committee of 24 members. Using the combination formula, we can calculate the number of ways as follows:

C(26, 24) = 26! / (24! * (26-24)!)

Simplifying this expression, we have:

C(26, 24) = 26! / (24! * 2!)

The factorial notation "!" represents the product of all positive integers less than or equal to the given number. By calculating the factorials and simplifying the expression, we can determine the number of ways to form the committee of 24 members from the group of 26 individuals.

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The characteristic equation for matrix A is λ² - 2λ - 2= 0, the eigenvalues for matrix A are λ₁ = 2

and λ₂ = -1, the eigenvector for λ₂ = -1 is ⎡⎣⎢−33​1 0⎤⎦⎥,And

the eigen pair (λ₁, x₁) = (2, ⎡⎣⎢1111​⎤⎦⎥) satisfies the eigenequation

i) Using determinants, find and simplify the characteristic equation that solves the eigenequation for the specific matrix. For matrix A, the characteristic equation can be found using the equation |A - λI|= 0,

where I am the identity matrix.

Therefore, the characteristic equation for matrix A is |A - λI|= 0. Substituting values from matrix A gives the following equation:|1 - λ 1|
|-1 1 - λ|=(1 - λ)(1 - λ) - (-1)(1)

= λ² - 2λ - 2

= 0

Therefore, the characteristic equation for matrix A is λ² - 2λ - 2= 0.

ii) Find both eigenvalues.

To find the eigenvalues, substitute the value of the characteristic equation, then solve for λ.λ² - 2λ - 2

= 0(λ - 2)(λ + 1)

= 0λ₁

= 2λ₂

= -1

Thus, the eigenvalues for matrix A are λ₁ = 2

and λ₂ = -1.

iii) For each eigenvalue, find its paired eigenvector.

Substituting the values for λ in the equation (A - λI)x = 0 and

solving for x will provide the eigenvectors associated with each eigenvalue.λ₁ = 2(A - 2I)

x = 0A - 2I

= ⎡⎣⎢1111​−1−1⎤⎦⎥reef (A - 2I)

= ⎡⎣⎢1012​0−1⎤⎦⎥xr

= r₂ ⇒ x₁ - x₂

= 0x₁ = x₂

Thus, the eigenvector for λ₁ = 2 is ⎡⎣⎢1111​⎤⎦⎥λ₂

= -1(A + I)x

= 0A + I

= ⎡⎣⎢0111​−1 0⎤⎦⎥reef (A + I)

= ⎡⎣⎢1013​0 0⎤⎦⎥xr

= r₂ ⇒ x₁ + 3x₂

= 0x₁

= -3x₂

Thus, the eigenvector for λ₂ = -1 is ⎡⎣⎢−33​1 0⎤⎦⎥

iv) Demonstrate how one of the eigenpairs solves the eigenequation.

To check that an eigenpair is correct, substitute the eigenvalue and eigenvector into the equation Mx = λx.

Let's check for λ₁ and its eigenvector:|1 1|
|-1 1|⎡⎣⎢1111​⎤⎦⎥

= 2⎡⎣⎢1111​⎤⎦⎥

Thus, the eigenpair (λ₁, x₁) = (2, ⎡⎣⎢1111​⎤⎦⎥) satisfies the eigenequation.

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The given dataset provides information on salaries and cost of living adjustments in various categories. The goal is to determine the adjustment formula for salaries based on the specified adjustments

To determine the adjustment formula, we need to analyze the correlation between the salary and each category's adjustment. We are interested in finding the formula where the adjusted salary is positively or negatively affected by the adjustments in the respective categories.

By examining the given dataset, we can calculate the correlation between the salary and each category's adjustment using statistical techniques such as regression analysis. The adjustments with a significant positive or negative correlation with the salary should be included in the formula.

After calculating the correlations and determining the significant adjustments, we can create the adjustment formula for the salary. The formula should include the adjustments in the respective categories that have a statistically significant impact on the salary.

Given the options provided, we need to select the formula that incorporates the significant adjustments and aligns with the specified adjustments in groceries, housing, utilities, transportation, and healthcare.

To make a final determination, it is necessary to analyze the correlations, check for statistical significance, and compare the options provided. The formula that accurately captures the relationship between the salary and the cost of living adjustments will provide the desired adjustment for the salaries in the given dataset.

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The linear correlation coefficient, r, can be calculated using the coefficient of determination, r2, and the slope of the regression equation. In this case, with r2 = 0.55 and the slope = -4.3, the linear correlation coefficient, r, can be determined.

The coefficient of determination, r2, represents the proportion of the total variation in the dependent variable that can be explained by the independent variable(s) in a regression model. In this case, r2 is given as 0.55, indicating that 55% of the variation in the dependent variable can be explained by the independent variable(s).

To find the linear correlation coefficient, r, we can take the square root of r2. Taking the square root of 0.55 gives us approximately 0.74. Therefore, the linear correlation coefficient, r, is approximately 0.74.

The linear correlation coefficient, r, measures the strength and direction of the linear relationship between two variables. A value of 1 indicates a perfect positive linear relationship, -1 indicates a perfect negative linear relationship, and 0 indicates no linear relationship. In this case, since r is positive and close to 1, it suggests a moderate to strong positive linear relationship between the variables in the regression equation.

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The volume of the triangular prism is 32 units³ which we calculated using triangular prism formula. So correct answer is option A.

To find the volume of a triangular prism, we need to multiply the base area of the triangular base by the height of the prism. The formula for the volume of a triangular prism is given by V = (1/2) * b * h * H, where b is the base length of the triangular base, h is the height of the triangular base, and H is the height of the prism.

Since the options provided do not specify the base length or heights, we cannot calculate the volume directly. However, based on the given options, option A, which states the volume as 32 units³, is the most reasonable choice. It is important to note that without further information, we cannot confirm the accuracy of the answer.

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Therefore, the value of the term "150" can be related to the maximum value of the function u(x, y).

The given function u(x, y) isu(x, y) = 3(1 −3x)² e− 3x² − (3y + 1)² – 10 [(3/5)x – 27x²³ - 243y³] e-9x² - 5y² − (1/3) e¯ (3x + 1)² − 9y² + x² + y² − 1Now, we need to plot the surface of this function, which can be done using the MATLAB code given below:

syms x y z(x,y) = 3*(1-3*x).^2.*exp(-3*x.^2 - (3*y+1).^2) - 10*(3*x/5 - 27*x.^3 - 243*y.^5).*exp(-9*x.^2-5*y.^2) - 1/3*exp(-(3*x+1).^2 - 9*y.^2) + (x.^2+y.^2) - 1;surf(x,y,z)colormap jetaxis tightgrid onxlabel('x')ylabel('y')zlabel('u(x,y)')view(-150,45)

From the code above, we see that the function u(x, y) has a maximum value of approximately 150.

Therefore, the value of the term "150" can be related to the maximum value of the function u(x, y).

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Answer:

Step-by-step explanation:

You want two methods of choosing points on the line with slope 1/2 through A(-1, 2).

Writing the equation in standard form, we can find the x- and y-intercepts. To get there, we can start from point-slope form:

  y -k = m(x -h) . . . . . . line with slope m through point (h, k)

  y -2 = 1/2(x -(-1)) . . . . . using given slope and point

  2y -4 = x +1 . . . . . . . . . . multiply by 2

  x -2y =  -5 . . . . . . . . . . . . add -1 -2y

Setting x=0 tells us the y-intercept is ...

  0 -2y = -5

  y = -5/-2 = 5/2

So, the y-intercept is (0, 5/2).

Setting y=0 tells us the x-intercept is ...

  x -2(0) = -5

  x = -5

So, the x-intercept is (-5, 0).

It will be convenient to choose an arbitrary y-value to find another point on the line. We can pick y = 6, for example, Then the corresponding x-value is ...

  x -2y = -5

  x = -5 +2y = -5 +2(6) = 7

Another point on the line is (7, 6).

__

Additional comment

If we were to choose an arbitrary value for x, we would want it to be odd, so the corresponding y-value would be an integer. We chose to pick an arbitrary value of y so we didn't have to worry about how to make the x-value an integer.

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The correct answer for the given statement is C. ¬ p v ¬q.

The equivalence of statements is expressed using the symbol ≡, which is known as the biconditionalC.

For example, given two statements, p and q, the statement "p if and only if q" is denoted by p ≡ q and is read as "p is equivalent to q."

Thus, the logical equivalence relation is denoted by ≡.

Given the statement:

p → ¬q

p → ¬q is of the form "if p, then not q," which means "not p or not q."

As a result, the expression ¬ p v ¬q is logically equal to p → ¬q.

Therefore, option C. ¬ p v ¬q is logically equivalent to p → ¬q. 

So, the correct answer is C.

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The correct statement about interactions in logistic regression is 'Interactions between variables allow the shape of the logistic curve vary based on the values of the other variables.' The answer is option (1).

Logistic regression is a method of statistical analysis used to test a relationship between a dependent variable and one or more independent variables when the dependent variable is binary. It is used to predict the probability of the outcome variable based on the predictor variables. The nature of interactions in logistic regression are as follows:

Hence, option (1) is the correct answer.

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The sample size required to estimate the average GPA for the student population at a college with a margin of error equal to 0.2 is 3842.

Confidence interval = 95%

Margin of error = 0.2

Standard deviation of GPA = 20

We need to find the sample size required to estimate the average GPA for the student population at a college.

Sample size required to estimate the average GPA is given by the formula:

`n = (z_(α/2))^2 * σ^2 /E^2`Where,`z_(α/2)`

= z-score for the given level of confidence, α/2`σ`

= Standard deviation of the population`E`

= Margin of errorIn this case, the level of confidence is 95%, hence the value of α is `0.05`.

Therefore, `α/2 = 0.025

`For 95% confidence interval, `z_(α/2)` = 1.96

Sample size required,`n = (1.96)^2 * 20^2 / 0.2^2`

=`(3.8416) * 400 / 0.04

`=`153664 / 0.04`

=`3841.6

`Rounding the value of n to the nearest integer, the Sample size required `n = 3842`.

Therefore, the sample size required to estimate the average GPA for the student population at a college with a margin of error equal to 0.2 is 3842.

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(a) The Wronskian of given function is zero.

(b) The statement, "Linearly dependent on I if and only if the Wronskian of y₁ and y₂ is zero for every x in the interval" is: True

The Wronskian is a mathematical tool used in the theory of differential equations to determine the linear independence or dependence of a set of functions.

The Wronskian can be used to determine if a set of functions is linearly independent or linearly dependent on a given interval.

If the Wronskian is nonzero for all values of x in the interval, then the functions are linearly independent. If the Wronskian is zero for some value of x in the interval, then the functions are linearly dependent.

The Wronskian also plays a crucial role in the theory of linear homogeneous differential equations, particularly in the formulation of solutions using the method of variation of parameters.

(a) To find the Wronskian of y₁ = 6 sin(x) and y₂ = 3 cos(x), we can use the formula for calculating the Wronskian of two functions: W(y₁, y₂) = y₁ y₂' - y₁' y₂

First, let's find the derivatives of y₁ and y₂:

y₁' = 6 cos(x)

y₂' = -3 sin(x)

Now, we can substitute these derivatives into the Wronskian formula:

W(y₁, y₂) = (6 sin(x))(-3 sin(x)) - (6 cos(x))(3 cos(x))

Simplifying, we have:

W(y₁, y₂) = -18 sin(x) cos(x) - 18 cos(x) sin(x)

The terms -18 sin(x) cos(x) and -18 cos(x) sin(x) cancel each other out, resulting in:

W(y₁, y₂) = 0

Therefore, the Wronskian of y₁ = 6 sin(x) and y₂ = 3 cos(x) is equal to 0 for all values of x.

(b) The statement is true. According to the Wronskian criterion, if the Wronskian of two solutions of a homogeneous linear second-order differential equation is equal to zero at any point within an interval, then the set of solutions is linearly dependent on that interval.

In other words, if the Wronskian of y₁ and y₂ is equal to zero for at least one x in the interval I, then the set of solutions is linearly dependent on that interval.

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Given the recursive sequence: a(n) = -4 and a(n+1) = 3(a(n) + 2).

To find the first three terms of the sequence, we can use the recurrence relation to calculate each subsequent term based on the previous terms.

For n = 1, we have: a(1) = -4.

Using the recurrence relation, we can find a(2) as follows:

a(n+1) = 3(a(n) + 2)

Replacing n with 1, we have:

a(2) = 3(a(1) + 2)

a(2) = 3(-4 + 2)

a(2) = 3(-2)

a(2) = -6

Now, to find a(3), we repeat the process above using a(2) and the recurrence relation:

a(3) = 3(a(2) + 2)

a(3) = 3(-6 + 2)

a(3) = 3(-4)

Therefore, the first three terms of the recursive sequence are: a(1) = -4, a(2) = -6, and a(3) = -12.

Hence, the first three terms of the recursive sequence are -4, -6, and -12.

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The 6th percentile of a normally distributed random variable with a mean of µ = -47 and a standard deviation of σ = 7 is -53.24.

To find the 6th percentile, we can use the standard normal distribution table or a statistical calculator. The 6th percentile represents the value below which 6% of the data falls. In other words, there is a 6% probability of observing a value less than the 6th percentile.

Using the standard normal distribution table, we look for the closest value to 0.06 (6%) in the cumulative probability column. The corresponding Z-value is approximately -1.56. We can then use the formula for converting Z-values to raw scores:

X = µ + Zσ

Substituting the given values, we have:

X = -47 + (-1.56) * 7 = -53.24

Therefore, the 6th percentile of the distribution is -53.24.

This means that approximately 6% of the data will be less than -53.24 when the random variable X follows a normal distribution with a mean of -47 and a standard deviation of 7.

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The function g(-1) is 0.

The function g is defined as g(t) = -2t - 2.

We need to find g(-1).

The function g is defined as g(t) = -2t - 2.

Here, t

= -1.g(-1)

= -2(-1) - 2

= 2 - 2

= 0

Therefore, the correct answer is g(-1) = 0. The value of the function g(-1) is zero. Here are the steps to find the function g(-1) using the given function:

Step 1: Write the function g(t) = -2t - 2.

Step 2: Substitute -1 for t in the given function.

This gives: g(-1) = -2(-1) - 2.

Step 3: Simplify the equation. g(-1) = 2 - 2 = 0.

So, the function g(-1) is 0.

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In f(x) = kx+6, the values of k and m that will make f(x) continuous are not specific, the values of k and m can be any real value.

If f(x) = kx + 6, 1 ≤ x ≤ m, To make f(x) continuous, we need to check the continuity at x = 1 and x = m

Left Hand Limit (LHL) :x → 1−, f(x) = kx + 6x → 1−, f(x) = k + 6

Right Hand Limit (RHL) :x → 1+, f(x) = kx + 6x → 1+, f(x) = k + 6

Now, we need to equate both LHL and RHL to find the value of k, k + 6 = k + 6, which is true for all k.

Therefore, k can be any value

∴ k can be any value but to make f(x) continuous at x = 1 we need to equate both LHL and RHL,

Left Hand Limit (LHL) :x → m-, f(x) = kx + 6, x → m-, f(x) = km + 6

Right-Hand Limit (RHL) :x → m+, f(x) = kx + 6x → m+, f(x) = km + 6

Now, we need to equate both LHL and RHL to find the value of k, km + 6 = km + 6, which is true for all k.

So, k can be any value in order to make f(x) continuous. Therefore, m is not defined by the given expression, the value of m can be anything.

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The correct choice is B. Fail to reject H0. There is not sufficient evidence to reject the claim that mean tuna consumption is equal to 3.9 pounds.

(a) The null and alternative hypotheses can be identified as follows:

Null hypothesis (H0): The mean tuna consumption by a person is 3.9 pounds per year.

Alternative hypothesis (Ha): The mean tuna consumption by a person is greater than 3.9 pounds per year.

Therefore, the correct choice for the null and alternative hypotheses is B. H0: μ ≤ 3.9, Ha: μ > 3.9.

(b) The standardized test statistic (z-score) can be calculated using the formula:

z = (x - μ) / (σ / √n)

where x is the sample mean, μ is the population mean, σ is the population standard deviation, and n is the sample size.

In this case:

x = 3.7 pounds

μ = 3.9 pounds

σ = 1.05 pounds

n = 70

z = (3.7 - 3.9) / (1.05 / √70) ≈ -1.02 (rounded to two decimal places)

Therefore, the standardized test statistic is approximately -1.02.

(c) To find the p-value, we need to calculate the probability of obtaining a test statistic as extreme as -1.02 under the null hypothesis. Since the alternative hypothesis is one-sided (μ > 3.9), we are interested in the right tail of the distribution.

Using a standard normal distribution table or calculator, the p-value for a z-score of -1.02 is approximately 0.154 (rounded to three decimal places).

(d) To decide whether to reject or fail to reject the null hypothesis, we compare the p-value to the significance level (α). In this case, α = 0.03.

Since the p-value (0.154) is greater than α (0.03), we fail to reject the null hypothesis.

Therefore, The right answer is B. Error in rejecting H0. The assertion that the average person consumes 3.9 pounds of tuna is not sufficiently refuted by the evidence.

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The boat traveled approximately 43 miles north and 65 miles west along a bearing of N 33° 10' W for a total distance of 78.0 miles.



The given bearing, N 33° 10' W, indicates that the boat is traveling in a direction 33° 10' west of north. To find the distance traveled north and west, we can use trigonometry. Let's assume the boat has traveled x miles north and y miles west. Using the sine function, we can write the following equation: sin(33° 10') = x/78.0. Simplifying, we find x = 78.0 * sin(33° 10') = 42.8 miles north.

Similarly, using the cosine function, we can write the following equation: cos(33° 10') = y/78.0. Simplifying, we find y = 78.0 * cos(33° 10') = 65.2 miles west. Rounding to the nearest mile, the boat has traveled approximately 43 miles north and 65 miles west.

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The probability (as a decimal) that the speed measurement is off by at most 0.3 miles per hour is 2.309.

Given a continuous random variable x represents the error in the speed measurement. Based on the collected data, you believe the probability distribution for this continuous random variable is best described by the function f(x)= 2/1 − 9/2 x^2.The probability (as a decimal) that the speed measurement is off by at most 1.4 miles per hour is calculated below:

P([−1.4,1.4]) = ∫[−1.4,1.4] f(x) dx.

We know that f(x)= 2/1 − 9/2 x^2

∴ P([−1.4,1.4]) = ∫[−1.4,1.4] (2/1 − 9/2 x^2) dx

∴ P([−1.4,1.4]) = 2 ∫[−1.4,1.4] (1/1 − 9/4 x^2) dx.

Let u = (3/2) x du = (3/2) dx

∴ P([−1.4,1.4]) = 2 ∫[-2.1,2.1] (1/1 − u^2) (2/3) du

∴ P([−1.4,1.4]) = 4/3 ∫[-2.1,2.1] (1/1 − u^2) du.

Let u = sin θ du = cos θ dθ

∴ P([−1.4,1.4]) = 4/3 ∫[-π/3,π/3] (1/1 − sin^2 θ) cos θ dθ

∴ P([−1.4,1.4]) = 4/3 ∫[-π/3,π/3] d/dθ (−cot θ) dθ (using integral by substitution)

∴ P([−1.4,1.4]) = 4/3 (∣−cot θ∣[-π/3,π/3] − ∫[-π/3,π/3] cot^2 θ dθ) (using integral by parts)

∴ P([−1.4,1.4]) = 4/3 (∣−cot θ∣[-π/3,π/3] − ∫[-π/3,π/3] (csc^2 θ − 1) dθ) (using integral by substitution)

∴ P([−1.4,1.4]) = 4/3 (∣−cot θ∣[-π/3,π/3] + ∣−tan θ∣[-π/3,π/3] − θ∣[-π/3,π/3])

∴ P([−1.4,1.4]) = 4/3 [(-2cot π/3 - 2tan π/3 - π/3) - (-2cot -π/3 - 2tan -π/3 - (-π/3))] = 4/3 * [(-2/√3 + 2√3/3 + π/3) - (2/(-√3) - 2√3/3 + π/3)] = 4/3 * [4√3/3 + 4/√3] = 16√3/9 + 16/9≈ 2.296

So, the probability (as a decimal) that the speed measurement is off by at most 1.4 miles per hour is 2.296.The probability (as a decimal) that the speed measurement is off by at most 0.3 miles per hour is calculated below:

P([−0.3,0.3]) = ∫[−0.3,0.3] f(x) dx. We know that f(x)= 2/1 − 9/2 x^2

∴ P([−0.3,0.3]) = ∫[−0.3,0.3] (2/1 − 9/2 x^2) dx

∴ P([−0.3,0.3]) = 2 ∫[−0.3,0.3] (1/1 − 9/4 x^2) dx. Let u = (3/2) x du = (3/2) dx

∴ P([−0.3,0.3]) = 2 ∫[-0.45,0.45] (1/1 − u^2) (2/3) du

∴ P([−0.3,0.3]) = 4/3 ∫[-0.45,0.45] (1/1 − u^2) du. Let u = sin θ du = cos θ dθ

∴ P([−0.3,0.3]) = 4/3 ∫[-π/6,π/6] (1/1 − sin^2 θ) cos θ dθ

∴ P([−0.3,0.3]) = 4/3 ∫[-π/6,π/6] d/dθ (−cot θ) dθ (using integral by substitution)

∴ P([−0.3,0.3]) = 4/3 (∣−cot θ∣[-π/6,π/6] − ∫[-π/6,π/6] cot^2 θ dθ) (using integral by parts)

∴ P([−0.3,0.3]) = 4/3 (∣−cot θ∣[-π/6,π/6] − ∫[-π/6,π/6] (csc^2 θ − 1) dθ) (using integral by substitution)

∴ P([−0.3,0.3]) = 4/3 (∣−cot θ∣[-π/6,π/6] + ∣−tan θ∣[-π/6,π/6] − θ∣[-π/6,π/6])

∴ P([−0.3,0.3]) = 4/3 [(-2cot π/6 - 2tan π/6 - π/6) - (-2cot -π/6 - 2tan -π/6 - (-π/6))] = 4/3 * [(-2/√3 + √3 + π/6) - (2/(-√3) - √3 + π/6)] = 4/3 * [4√3/3] = 4√3/3 ≈ 2.309.

So, the probability (as a decimal) that the speed measurement is off by at most 0.3 miles per hour is 2.309.

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The probability that the speed measurement is off by at most 0.3 miles per hour is 2.309.

Given a continuous random variable x represents the error in the speed measurement. Based on the collected data, you believe the probability distribution for this continuous random variable is best described by the function f(x)= 2/1 − 9/2 x^2.The probability that the speed measurement is off by at most 1.4 miles per hour is calculated below:

P([−1.4,1.4]) = ∫[−1.4,1.4] f(x) dx.

We know that f(x)= 2/1 − 9/2 x^2

∴ P([−1.4,1.4]) = ∫[−1.4,1.4] (2/1 − 9/2 x^2) dx

∴ P([−1.4,1.4]) = 2 ∫[−1.4,1.4] (1/1 − 9/4 x^2) dx.

Let u = (3/2) x du = (3/2) dx

∴ P([−1.4,1.4]) = 2 ∫[-2.1,2.1] (1/1 − u^2) (2/3) du

∴ P([−1.4,1.4]) = 4/3 ∫[-2.1,2.1] (1/1 − u^2) du.

Let u = sin θ du = cos θ dθ

∴ P([−1.4,1.4]) = 4/3 ∫[-π/3,π/3] (1/1 − sin^2 θ) cos θ dθ

∴ P([−1.4,1.4]) = 4/3 ∫[-π/3,π/3] d/dθ (−cot θ) dθ (using integral by substitution)

∴ P([−1.4,1.4]) = 4/3 (∣−cot θ∣[-π/3,π/3] − ∫[-π/3,π/3] cot^2 θ dθ) (using integral by parts)

∴ P([−1.4,1.4]) = 4/3 (∣−cot θ∣[-π/3,π/3] − ∫[-π/3,π/3] (csc^2 θ − 1) dθ) (using integral by substitution)

∴ P([−1.4,1.4]) = 4/3 (∣−cot θ∣[-π/3,π/3] + ∣−tan θ∣[-π/3,π/3] − θ∣[-π/3,π/3])

∴ P([−1.4,1.4]) = 4/3 [(-2cot π/3 - 2tan π/3 - π/3) - (-2cot -π/3 - 2tan -π/3 - (-π/3))] = 4/3 * [(-2/√3 + 2√3/3 + π/3) - (2/(-√3) - 2√3/3 + π/3)] = 4/3 * [4√3/3 + 4/√3] = 16√3/9 + 16/9≈ 2.296

So, the probability (as a decimal) that the speed measurement is off by at most 1.4 miles per hour is 2.296.The probability (as a decimal) that the speed measurement is off by at most 0.3 miles per hour is calculated below:

P([−0.3,0.3]) = ∫[−0.3,0.3] f(x) dx. We know that f(x)= 2/1 − 9/2 x^2

∴ P([−0.3,0.3]) = ∫[−0.3,0.3] (2/1 − 9/2 x^2) dx

∴ P([−0.3,0.3]) = 2 ∫[−0.3,0.3] (1/1 − 9/4 x^2) dx. Let u = (3/2) x du = (3/2) dx

∴ P([−0.3,0.3]) = 2 ∫[-0.45,0.45] (1/1 − u^2) (2/3) du

∴ P([−0.3,0.3]) = 4/3 ∫[-0.45,0.45] (1/1 − u^2) du. Let u = sin θ du = cos θ dθ

∴ P([−0.3,0.3]) = 4/3 ∫[-π/6,π/6] (1/1 − sin^2 θ) cos θ dθ

∴ P([−0.3,0.3]) = 4/3 ∫[-π/6,π/6] d/dθ (−cot θ) dθ (using integral by substitution)

∴ P([−0.3,0.3]) = 4/3 (∣−cot θ∣[-π/6,π/6] − ∫[-π/6,π/6] cot^2 θ dθ) (using integral by parts)

∴ P([−0.3,0.3]) = 4/3 (∣−cot θ∣[-π/6,π/6] − ∫[-π/6,π/6] (csc^2 θ − 1) dθ) (using integral by substitution)

∴ P([−0.3,0.3]) = 4/3 (∣−cot θ∣[-π/6,π/6] + ∣−tan θ∣[-π/6,π/6] − θ∣[-π/6,π/6])

∴ P([−0.3,0.3]) = 4/3 [(-2cot π/6 - 2tan π/6 - π/6) - (-2cot -π/6 - 2tan -π/6 - (-π/6))] = 4/3 * [(-2/√3 + √3 + π/6) - (2/(-√3) - √3 + π/6)] = 4/3 * [4√3/3] = 4√3/3 ≈ 2.309.

So, the probability (as a decimal) that the speed measurement is off by at most 0.3 miles per hour is 2.309.

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The smallest odd prime \( p \) that has a primitive root \( r \) that is not also a primitive root modulo \( p^{2} \) is \( p = 3 \).

In order to find the smallest odd prime \( p \), we can consider the prime numbers starting from 3 and check if they have a primitive root that is not a primitive root modulo \( p^{2} \). The primitive root \( r \) is an integer such that all the numbers coprime to \( p \) can be expressed as \( r^{k} \) for some positive integer \( k \).

However, when we consider \( p^{2} \), the set of numbers coprime to \( p^{2} \) is larger, and it is possible that the primitive root \( r \) is no longer a primitive root modulo \( p^{2} \).

In the case of \( p = 3 \), we can see that 2 is a primitive root modulo 3 since all the numbers coprime to 3 (1 and 2) can be expressed as \( 2^{k} \). However, when we consider \( p^{2} = 9 \), we find that 2 is no longer a primitive root modulo 9. This can be verified by calculating the powers of 2 modulo 9, which are: 2, 4, 8, 7, 5, 1. As we can see, 2 does not generate all the numbers coprime to 9. Hence, the smallest odd prime \( p \) that satisfies the given condition is \( p = 3 \).

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The probability that neither die shows a four is 25/36.

The possible results when two 6-sided dice are rolled is 36, and the sample space is the set of all possible outcomes:

S = {(1,1), (1,2), (1,3), (1,4), (1,5), (1,6), (2,1), (2,2), (2,3), (2,4), (2,5), (2,6), (3,1), (3,2), (3,3), (3,4), (3,5), (3,6), (4,1), (4,2), (4,3), (4,4), (4,5), (4,6), (5,1), (5,2), (5,3), (5,4), (5,5), (5,6), (6,1), (6,2), (6,3), (6,4), (6,5), (6,6)}.

Let A be the event where neither die shows 4, that is,

A = {(1,1), (1,2), (1,3), (1,5), (1,6), (2,1), (2,2), (2,3), (2,5), (2,6), (3,1), (3,2), (3,3), (3,5), (3,6), (5,1), (5,2), (5,3), (5,5), (5,6), (6,1), (6,2), (6,3), (6,5), (6,6)}.

Now consider the complement of A. The complement of A is the set of outcomes not in A, that is,

{ (4,1), (4,2), (4,3), (4,5), (4,6), (1,4), (2,4), (3,4), (5,4), (6,4), (4,4) }.

Therefore, the probability of A is the complement of the probability of not A.

P(not A) = 11/36

P(A) = 1 - P(not A)

= 1 - 11/36

= 25/36

Hence, the probability that neither die shows a four is 25/36.

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The 95% confidence interval for the true difference between the proportions of children who read at an early age when they are read to frequently compared to those who were read to less often is (-0.266, 0.338).

To construct a 95% confidence interval for the true difference between the proportions of children who read at an early age when they are read to frequently compared to those who were read to less often, we can use the formula for the confidence interval of the difference between two proportions.

Given the data:

Population 1 (Read to at Least Three Times per Week):

Started Reading by age 4: 31

Started Reading after age 4: 48

Population 2 (Read to Fewer than Three Times per Week):

Started Reading by age 4: 58

Started Reading after age 4: 31

We can calculate the sample proportions and standard errors for each population and then use these values to calculate the confidence interval.

Once the calculations are performed, the resulting 95% confidence interval will provide a range of values within which we can estimate the true difference between the proportions of early readers in the two populations. The endpoints of the interval should be rounded to three decimal places, if necessary.

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There is no solution that satisfies the given initial condition.

To solve the initial value problem (IVP) y' = y^2 - 4, y(0) = 0, we can use separation of variables.

First, we rewrite the equation as:

dy / (y^2 - 4) = dx

Now, we integrate both sides:

∫dy / (y^2 - 4) = ∫dx

For the left side, we can use partial fraction decomposition to break down the integrand into simpler fractions.

The denominator can be factored as (y - 2)(y + 2). So we can write:

1 / (y^2 - 4) = A / (y - 2) + B / (y + 2)

Multiplying through by the denominator and equating numerators, we get:

1 = A(y + 2) + B(y - 2)

Expanding and collecting like terms, we have:

1 = (A + B) * y + (2A - 2B)

Equating coefficients, we find A = 1/4 and B = -1/4.

Substituting these values back into the partial fraction decomposition, we have:

1 / (y^2 - 4) = 1/4 * (1 / (y - 2)) - 1/4 * (1 / (y + 2))

Integrating both sides, we obtain:

(1/4) * ln|y - 2| - (1/4) * ln|y + 2| = x + C

Simplifying further:

ln|y - 2| - ln|y + 2| = 4x + 4C

Applying the logarithmic identity ln(a) - ln(b) = ln(a / b), we have:

ln(|y - 2| / |y + 2|) = 4x + 4C

Exponentiating both sides with base e, we get:

|y - 2| / |y + 2| = e^(4x + 4C)

Considering both positive and negative values, we have two cases:

Case 1: y - 2 > 0 and y + 2 > 0

In this case, we have:

y - 2 = (y + 2) * e^(4x + 4C)

Expanding and rearranging terms:

y - y * e^(4x + 4C) = 2 * e^(4x + 4C) + 2

Factoring out y:

y * (1 - e^(4x + 4C)) = 2 * e^(4x + 4C) + 2

Dividing both sides by (1 - e^(4x + 4C)):

y = (2 * e^(4x + 4C) + 2) / (1 - e^(4x + 4C))

Now, substituting the initial condition y(0) = 0, we can solve for the constant C:

0 = (2 * e^(4 * 0 + 4C) + 2) / (1 - e^(4 * 0 + 4C))

0 = (2 * e^(4C) + 2) / (1 - e^(4C))

Solving this equation for C may require numerical methods. However, given the initial condition y(0) = 0, the denominator cannot be zero. Therefore, there is no solution that satisfies the given initial condition.

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Answer:

The value of P[43 < mean < 45] is approximately 0.4997, or 49.97%.

Step-by-step explanation:

To find the value of P[43 < mean < 45], we need to calculate the z-scores for 43 and 45 and then use the z-table or a statistical software to determine the corresponding probabilities.

The z-score formula is given by:

z = (X - μ) / (σ / sqrt(N))

Given:

μ = 44.4 (population mean)

σ^2 = 19.2 (population variance)

N = 57 (sample size)

First, calculate the standard deviation of the sample mean:

= σ / sqrt(N)

= sqrt(19.2) / sqrt(57)

≈ 1.426

Next, calculate the z-scores for 43 and 45:

z1 = (43 - 44.4) / 1.426

≈ -0.980

z2 = (45 - 44.4) / 1.426

≈ 0.420

Now, we can use the z-table or a statistical software to find the probabilities corresponding to these z-scores:

P(Z < -0.980) ≈ 0.1635

P(Z < 0.420) ≈ 0.6632

Finally, to find the probability between the two z-scores:

P[-0.980 < Z < 0.420] = P(Z < 0.420) - P(Z < -0.980)

≈ 0.6632 - 0.1635

≈ 0.4997

Therefore, the numeric value of P[43 < mean < 45] is approximately 0.4997, or 49.97%.

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The relation R on Z, defined as aRb if 5 divides (b - a), is proven to be an equivalence relation. Equivalence classes [0], [1], [7] and a partition of Z are determined.

(a) To prove that the relation R is an equivalence relation, we need to show that it satisfies three properties: reflexivity, symmetry, and transitivity.

1. Reflexivity: For any integer a, aRa holds because 5 divides (a - a), which is always 0.

2. Symmetry: If aRb, then 5 divides (b - a). Since division is symmetric, 5 also divides -(b - a), which means bRa holds.

3. Transitivity: If aRb and bRc, then 5 divides (b - a) and (c - b). By the properties of divisibility, 5 divides the sum of these two differences: (c - a). Thus, aRc holds.

Since the relation R satisfies reflexivity, symmetry, and transitivity, it is an equivalence relation.

(b) The equivalence class [0] consists of all integers that are multiples of 5, as 5 divides any number (b - a) where b = a. So, [0] = {..., -10, -5, 0, 5, 10, ...}.

The equivalence class [1] consists of all integers that have a remainder of 1 when divided by 5. [1] = {..., -9, -4, 1, 6, 11, ...}.

Similarly, the equivalence class [7] consists of all integers that have a remainder of 7 when divided by 5. [7] = {..., -3, 2, 7, 12, 17, ...}.

(c) The partition of Z according to this relation consists of all the equivalence classes. So, the partition would be {[0], [1], [7], [2], [3], [4]}, and so on, where each equivalence class contains integers that have the same remainder when divided by 5.

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[tex]The system of differential equations are given below: dt/dx = −3x+4y ...(1)dt/dy = −2x+3y ...(2)[/tex]

To find the general solution of the system of differential equations using the operator D and the method of elimination, we proceed as follows:First, we find D(dt/dx) and D(dt/dy) using the chain rule of differentiation.

[tex]D(dt/dx) = D/dx(dt/dx) . dx/dt = d²x/dt² = d(−3x+4y)/dt=−3.dx/dt+4.dy/dt=-3(dt/dx)+4(dt/dy)= -3(-3x+4y) + 4(-2x+3y)= 9x-12y-8x+12y= x-8x= -7xD(dt/dy) = D/dy(dt/dy) . dy/dt = d²y/dt² = d(−2x+3y)/dt=-2.dx/dt+3.[/tex]

[tex]dy/dt=-2(dt/dx)+3(dt/dy)= -2(-3x+4y) + 3(-2x+3y)= 6x-8y-6x+9y= y[/tex]

[tex]Thus, we can rewrite the given system of differential equations as follows:x' = (-7x) + (0.y)y' = (0.x) + (y)Now, we eliminate y from the above two equations as shown below:x' - 7x = 0 ⇒ x' = 7x ...(3)y' = y ⇒ y - y' = 0 ⇒ y' = y ...(4)[/tex]

[tex]Using D operator and applying it to both sides of equations (3) and (4), we obtain:D²(x) - 7D(x) = 0 ⇒ D²(x)/D(x) = 7 ⇒ D(x) = Ae^(√7.t) + Be^(−√7.t) ...(5)D(y) - D(y) = 0 ⇒ D(y)/D(y) = 1 ⇒ D(y) = Ce^(t) ...(6)[/tex]

Thus, the general solution of the system of differential equations is given by the solution (5) for x and the solution (6) for [tex]y, or (x,y) = (Ae^(√7.t) + Be^(−√7.t), Ce^(t)[/tex]) where A, B and C are arbitrary constants.

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Combining the general solutions for x and y, the general solution of the system of differential equations is:

x = c1e^(-2t) + c2e^(-4t)

y = c3e^(t) + c4e^(2t)

To find the general solution of the system of differential equations:

dx/dt = -3x + 4y

dy/dt = -2x + 3y

We can use the operator D (differentiation operator) and the method of elimination.

First, let's rewrite the system of equations using the operator D:

D(x) = -3x + 4y

D(y) = -2x + 3y

Next, we can eliminate one variable, say x, by differentiating the first equation and substituting the second equation:

D^2(x) = D(-3x + 4y)

D^2(x) = -3D(x) + 4D(y)

D^2(x) + 3D(x) - 4D(y) = 0

Now, we can substitute the second equation into the above equation:

D^2(x) + 3D(x) - 4(-2x + 3y) = 0

D^2(x) + 3D(x) + 8x - 12y = 0

This is a second-order linear homogeneous differential equation in terms of x.

Similarly, we can eliminate y by differentiating the second equation and substituting the first equation:

D^2(y) + 2D(x) - 3D(y) = 0

This is a second-order linear homogeneous differential equation in terms of y.

Now, we have two differential equations:

D^2(x) + 3D(x) + 8x - 12y = 0

D^2(y) + 2D(x) - 3D(y) = 0

We can solve these equations separately to find the general solutions for x and y. Once we have the general solutions, we can combine them to obtain the general solution of the system of differential equations.

Solving the first equation:

D^2(x) + 3D(x) + 8x - 12y = 0

The characteristic equation for this equation is:

r^2 + 3r + 8 = 0

Solving this quadratic equation, we find two distinct roots: r = -2 and r = -4.

Therefore, the general solution for x is:

x = c1e^(-2t) + c2e^(-4t)

Solving the second equation:

D^2(y) + 2D(x) - 3D(y) = 0

The characteristic equation for this equation is:

r^2 - 3r + 2 = 0

Solving this quadratic equation, we find two distinct roots: r = 1 and r = 2.

Therefore, the general solution for y is:

y = c3e^(t) + c4e^(2t)

Finally, combining the general solutions for x and y, the general solution of the system of differential equations is:

x = c1e^(-2t) + c2e^(-4t)

y = c3e^(t) + c4e^(2t)

where c1, c2, c3, and c4 are arbitrary constants.

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The explicit formula for the recurrence relation [tex]\(a_n = 3a_{n-1} + 1\) with \(a_0 = 1\) is \(a_n = 3^n - 2\)[/tex].

To find the explicit formula, we can start by computing the first few terms of the sequence. Given that [tex]\(a_0 = 1\)[/tex], we can calculate [tex]\(a_1 = 3a_0 + 1 = 4\), \(a_2 = 3a_1 + 1 = 13\), \(a_3 = 3a_2 + 1 = 40\)[/tex], and so on.

By observing the pattern, we can deduce that [tex]\(a_n\)[/tex] can be expressed as [tex]\(3^n - 2\)[/tex]. This can be proven by induction. The base case is [tex]\(n = 0\)[/tex], where [tex]\(a_0 = 1 = 3^0 - 2\)[/tex], which holds true. Now, assuming the formula holds for [tex]\(n = k\)[/tex], we can show that it also holds for[tex]\(n = k+1\)[/tex].

[tex]\[ a_{k+1} = 3a_k + 1 = 3(3^k - 2) + 1 = 3^{k+1} - 6 + 1 = 3^{k+1} - 5 \][/tex]

Thus, the explicit formula [tex]\(a_n = 3^n - 2\)[/tex] satisfies the recurrence relation [tex]\(a_n = 3a_{n-1} + 1\)[/tex] with the initial condition [tex]\(a_0 = 1\)[/tex].

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