Solve each system by substitution.

2y = y - x² + 1 y=x²- 5x - 2

The rate of change of the annual u.s. factory sales in 2000 is 7.7 billion dollars per year

From the question, we have the following parameters that can be used in our computation:

s(t) = 0.12t² − t + 5.7

In 2000, we have the value of t to be

t = 2000 - 1990

Evaluate

t = 10

So, we have

s(10) = 0.12 * 10² − 10 + 5.7

Evaluate

s(10) = 7.7

Hence, the rate in 2000 is 7.7 billion dollars per year

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Question

the rate of change of annual u.s. factory sales (in billions of dollars per year) of consumer electronic goods to dealers from 1990 through 2001 can be modeled as s(t) = 0.12t2 − t + 5.7 billion dollars per year

Calculate the rate of change in 2000

Answer:

gradient = 4/35

Step-by-step explanation:

Take two point (20, 2), (90, 10)

Gradient = [tex]\frac{y2-y1}{x2-x1} = \frac{10-2}{90-20} = \frac{4}{35}[/tex]

By comparing the responses across the three groups, the researcher can identify potential variations in opinions based on educational background. This information can provide valuable insights into how different types of schooling may shape perspectives on civic policies like curfews.

That's an interesting research approach!  By gathering opinions from different groups of children, specifically home-schooled, private school attendees, and public school attendees, the researcher can gain insights into how various educational backgrounds might influence their opinions on the new town curfew.

Collecting a simple random sample from each group ensures that every child within the respective groups has an equal chance of being selected for the survey. This helps in minimizing bias and increasing the generalizability of the findings to the larger population of home-schooled, private school, and public school children.

Once the samples are obtained, the researcher can administer a survey or questionnaire to collect the children's opinions on the new town curfew. The survey may include questions related to their awareness of the curfew, their understanding of its purpose, and their personal opinions on whether they support or oppose it.

By comparing the responses across the three groups, the researcher can identify potential variations in opinions based on educational background. This information can provide valuable insights into how different types of schooling may shape perspectives on civic policies like curfews.

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The percentage of the observations that lie between 9 and 25 is 57.79%

From the question, we have the following parameters that can be used in our computation:

Mean, x = 24

Standard deviation, SD = 5

The z-scores are then calculated as

z = (x - X)/SD

So, we have

z = (9 - 24)/5 = -3

z = (25 - 24)/5 = 0.2

The percentage that lie between 9 and 25 is

P = P(-3 < z < 0.2)

Using the table of z-scores, we have

P = 57.79%

Hence, the percentage is 57.79%

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Question

A quantitative data set has mean 24 and standard deviation 5. Approximately what percentage of the observations lie between 9 and 25?

The length of the third side of a right triangle can be found using the Pythagorean Theorem, which states that the square of the hypotenuse is equal to the sum of the squares of the other two sides.

The Pythagorean Theorem can be written as follows:

a^2 + b^2 = c^2

where a and b are the lengths of the two shorter sides of the triangle, and c is the length of the hypotenuse.

To find the length of the third side, we can simply plug in the lengths of the other two sides into the equation. For example, if the lengths of the two shorter sides are 3 cm and 4 cm, then the length of the hypotenuse is:

c^2 = 3^2 + 4^2 = 9 + 16 = 25

Taking the square root of both sides, we get:

c = sqrt(25) = 5 cm

Therefore, the length of the third side of the triangle is 5 cm.

It is important to note that the Pythagorean Theorem only works for right triangles. If the triangle is not a right triangle, then the Pythagorean Theorem cannot be used to find the length of the third side.

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A graph of the piecewise function is shown on the coordinate plane in the image attached below.

In Mathematics and Geometry, a piecewise-defined function simply refers to a type of function that is defined by two (2) or more mathematical expressions over a specific domain.

Generally speaking, the domain of any piecewise-defined function simply refers to the union of all of its sub-domains. By critically observing the graph of this piecewise-defined function, we can reasonably infer and logically deduce that it is constant over the interval -∞ ≤ x ≤ -2 or [-∞, -2].

In conclusion, the piecewise-defined function is increasing over the interval (0, 2] ∪ [2, ∞].

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17.7% represents the percentage of the radium-226 sample that remains after 4,000 years.

We have,

To calculate the percentage of a sample of radium-226 that remains after 4,000 years, we need to use the concept of half-life.

The half-life of radium-226 is approximately 1,600 years.

This means that after every 1,600 years, the amount of radium-226 is reduced by half.

To find the percentage of radium-226 that remains after 4,000 years, we can calculate the number of half-lives that have passed in that time:

Number of half-lives = 4,000 years / 1,600 years = 2.5 half-lives

Now, we can calculate the remaining percentage of the sample using the formula:

Remaining percentage = [tex](1/2)^{number of half-lives} * 100[/tex]

Plugging in the value of 2.5 half-lives into the formula:

Remaining percentage = [tex](1/2)^{2.5} * 100[/tex]

Calculating this, we find:

Remaining percentage ≈ 0.1768 * 100 ≈ 17.7%

Therefore,

17.7% represents the percentage of the radium-226 sample that remains after 4,000 years.

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There are two possible solutions for the missing term: 1.2247 or -1.2247.

To find the missing term in the geometric sequence 3, ², 0.75, . . ., we can observe the common ratio between consecutive terms.

The common ratio (r) can be found by dividing any term by its preceding term. Let's calculate it:

Common ratio (r) = ² / 3 = 0.75 / ² ≈ 0.3906

Now, to find the missing term, we need to determine whether it is the geometric mean or its opposite.

Option 1: Geometric Mean

The geometric mean can be calculated by taking the square root of the product of two consecutive terms in a geometric sequence. So, let's try this approach:

Missing Term = √(0.75 * ²) ≈ √(1.5) ≈ 1.2247

Option 2: Opposite of the Geometric Mean

In some cases, the missing term can be the negative value of the geometric mean. Therefore, let's consider the negative value of the geometric mean as another possibility:

Missing Term = -√(0.75 * ²) ≈ -√(1.5) ≈ -1.2247

Hence, there are two possible solutions for the missing term: 1.2247 or -1.2247.

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The area of rectangular prism is  98ft² .

Given,

A hollow rectangular prism, the monolith was 9 feet tall, 4 feet wide, and 1 foot deep.

Now,

The area of rectangular prism is given by

A = 2(wl + hl + hw)

Here,

w = width

l = length

h = height

Substitute the values in the formula,

A = 2(4*9 + 1*9 + 1*4)

A = 2(36 + 9 + 4)

A = 2(49)

A = 98ft²

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We can make the conjecture that the sum of the squares of two consecutive natural numbers is always equal to the square of their average value.

Conjecture: The sum of the squares of two consecutive natural numbers is always equal to the square of their average value.

Explanation: Let's consider two consecutive natural numbers, n and n+1. The square of n is given by n^2, and the square of (n+1) is given by (n+1)^2. The conjecture states that the sum of these squares, n^2 + (n+1)^2, will always be equal to the square of their average value.

To support this conjecture, let's consider some examples:

Example 1:

If we take n = 3, then n+1 = 4.

The sum of the squares is 3^2 + 4^2 = 9 + 16 = 25.

The average of 3 and 4 is (3+4)/2 = 7/2 = 3.5.

The square of the average is (3.5)^2 = 12.25.

Example 2:

If we take n = 5, then n+1 = 6.

The sum of the squares is 5^2 + 6^2 = 25 + 36 = 61.

The average of 5 and 6 is (5+6)/2 = 11/2 = 5.5.

The square of the average is (5.5)^2 = 30.25.

In both examples, we can observe that the sum of the squares of consecutive natural numbers (25 and 61) is indeed equal to the square of their average values (12.25 and 30.25). This pattern holds true for other examples as well.

Based on these examples, we can make the conjecture that the sum of the squares of two consecutive natural numbers is always equal to the square of their average value.

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(a) To find the probability that X is greater than 37, we use the cumulative standardized normal distribution table. First, we standardize the value by finding the z-score:

z = (37 - μ) / σ = (37 - 46) / 5 = -1.8

Using the table, we find the probability corresponding to the z-score of -1.8, which is 0.0359. However, we are interested in the probability that X is greater than 37, so we subtract this value from 1 to get 1 - 0.0359 = 0.9641.

(b) To find the probability that X is less than 41, we again standardize the value:

z = (41 - μ) / σ = (41 - 46) / 5 = -1.0

Using the table, we find the probability corresponding to the z-score of -1.0, which is 0.1587.

(c) To determine the X-value for which 9% of the values are less than, we need to find the corresponding z-score. We can use the inverse of the cumulative standardized normal distribution table to find the z-score that corresponds to a cumulative probability of 0.09. The z-score corresponding to a cumulative probability of 0.09 is approximately -1.34. We can then find the X-value by rearranging the formula for the z-score:

X = μ + (z * σ) = 46 + (-1.34 * 5) = 39.3

Rounding to the nearest integer, the X-value is 39.

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The volume of the secret room is 504 cubic yards.

To calculate the volume of the secret room shaped like a rectangular prism, we multiply its length, width, and height together.

The length of the room is given as 8 yards, the width as 7 yards, and the height as 9 yards.

Volume = Length × Width × Height

Volume = 8 yards × 7 yards × 9 yards

Calculating the multiplication:

Volume = 504 cubic yards

Therefore, the volume of the secret room is 504 cubic yards.

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Answer:

length = 13 in, width = 7 in , area = 91 in²

Step-by-step explanation:

let width be w then length = 2w - 1

perimeter(P) of rectangle is calculated as

P = 2 × length + 2× width

  = 2(2w - 1) + 2w

  = 4w - 2 + 2w

  = 6w - 2

given P = 40 , then

6w - 2 = 40 ( add 2 to both sides )

6w = 42 ( divide both sides by 6 )

w = 7

then

width = 7 in and length = 2w - 1 = 2(7) - 1 = 14 - 1 = 13 in

the area (A) of a rectangle is calculated as

A = length × width = 13 × 7 = 91 in²

The solution of number is,

⇒ √-15 = √15i

We have to give that,

Simplify the number by using the imaginary number i.

⇒ √-15

Since We know that,

⇒ i² = - 1

⇒ i = √- 1

Hence, We can simplify it as,

⇒ √-15

⇒ √15 × √- 1

⇒ √15 × i

⇒ √(15)i

Therefore, The solution is,

⇒ √-15 = √15i

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Answer:

a. 1/4

b. 13/51

c. 12/51

Step-by-step explanation:

Note:
The formula to find probability is:

P(A) = n(A) / n(S)

where:

For question:

a.

There are 13 hearts in a standard deck of 52 cards, so the probability of drawing a heart is 13/52.

The probability that the first card drawn is a heart is 13/52 = 1/4.

b.

Since the first card was not a heart, there are 13 hearts left in the deck. There are also 51 cards left in the deck overall, so the probability of drawing a heart is 13/51.

The probability that the second card drawn is a heart given that the first card drawn was not a heart is 13/51.

c.

Since the first card was a heart, there are 12 hearts left in the deck. There are also 51 cards left in the deck overall, so the probability of drawing a heart is 12/51.

The probability that the second card drawn is a heart given that the first card drawn was a heart is 12/51.

The given sequence 16, 7, -2 is arithmetic progression with a common difference of -9. The next term in the sequence is found by adding the common difference. Therefore, the complete sequence is 16, 7, -2, -11, ....

To determine whether the sequence 16, 7, -2, ... is arithmetic, we need to check if there is a common difference between consecutive terms.

The common difference (d) between consecutive terms of an arithmetic sequence is given by:

d = a(n) - a(n-1)

where a(n) is the nth term of the sequence.

From the given terms, we can see that:

a(1) = 16

a(2) = 7

a(3) = -2

Using the formula for the common difference, we have:

d = a(2) - a(1) = 7 - 16 = -9

d = a(3) - a(2) = -2 - 7 = -9

Since the common difference is the same for both pairs of consecutive terms, we can conclude that the sequence is arithmetic with a common difference of -9.

To find the next term in the sequence, we can add the common difference to the previous term:

a(4) = a(3) + d = -2 - 9 = -11

Therefore, the complete sequence is:

16, 7, -2, -11, ..

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If Fidel has a rare coin worth $550 and its value increases by 10% each decade, we can calculate the value of the coin after a certain number of decades by applying the compound interest formula.

The compound interest formula is given by:

A = P(1 + r)^n

Where:

A is the final amount (value of the coin after n decades)

P is the initial amount (value of the coin)

r is the interest rate per period (in decimal form)

n is the number of periods (in this case, the number of decades)

In this case, the initial amount (P) is $550 and the interest rate per decade (r) is 10% or 0.1 (in decimal form).

Let's calculate the value of the coin after 1 decade:

A = 550(1 + 0.1)^1

A = 550(1.1)

A = $605

After 1 decade, the value of the coin would be $605.

Similarly, we can calculate the value of the coin after multiple decades. For example, after 2 decades:

A = 550(1 + 0.1)^2

A = 550(1.1^2)

A = $665.50

After 2 decades, the value of the coin would be $665.50.

You can continue this calculation for any number of decades to determine the value of the coin.

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The optimal mix of crops to plant is 1,304 acres of soybeans, 761 acres of corn, and 341 acres of cotton, which will maximize the family's total profit.

3.51 Farm Management problem: Formulate and solve a linear programming model for this problem in a spreadsheet.The given table contains information about the labor-hours and fertilizer needed per acre and the total expected profit per acre for the potential crops under consideration.

Given that Dwight, Hattie, and their children can work at most 6.500 total hours during the upcoming season and have 200 tons of fertilizer available. We need to find the mix of crops that maximizes the family's total profit.Let x1, x2, and x3 be the amount of acres for soybeans, corn, and cotton, respectively.

We need to maximize the profit, which is given byZ = 70x1 + 60x2 + 90x3subject to the constraints given below:2x1 + 3x2 + 4x3 <= 6,500 (labor-hours constraint)3x1 + 2x2 + 4x3 <= 200 (fertilizer constraint)x1, x2, x3 >= 0 (non-negativity constraint)The linear programming model for this problem can be written as follows:maximize Z = 70x1 + 60x2 + 90x3Subject to:2x1 + 3x2 + 4x3 ≤ 6,5003x1 + 2x2 + 4x3 ≤ 200x1, x2, x3 ≥ 0Solving the problem using a spreadsheet, we get the following optimal solution.

 The optimal solution is obtained for x1 = 1,304 acres of soybeans, x2 = 761 acres of corn, and x3 = 341 acres of cotton.

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The solutions to the given quadratic equation, 3x²+2 x-1=0  are x = 1/3 and x = -1.

The given quadratic equation,

3x²+2 x-1=0

Since we know that,

For ax²+ bx + c = 0, where a, b, and c are constants.

The quadratic formula is,

x = (-b ± √(b² - 4ac)) / 2a

For the equation 3x²+2 x-1=0 ,

Identifying the values of a, b, and c.

In this case, a = 3, b = 2, and c = -1.

Substitute these values into the Quadratic Formula:

We get:

x = (-2 ± √(2² - 4*3*(-1))) / (2x3)

Simplifying the expression under the square root, we get:

x = (-2 ± √(4 + 12)) / 6

x = (-2 ± √16) / 6

Taking the square root of 16 gives us two possible solutions:

x = (-2 + 4) / 6 = 1/3

x = (-2 - 4) / 6 = -1

So the solutions to the equation 3x²+2 x-1=0  are x = 1/3 and x = -1.

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The centroid of the triangle with vertices A(-4, -5), B(-1, 2), and C(2, -4) is (-1, -7/3).

To find the centroid of a triangle, we need to calculate the average of the coordinates of the three vertices. The centroid is the point of concurrency where the medians of the triangle intersect.

Given the vertices of the triangle A(-4, -5), B(-1, 2), and C(2, -4), let's find the centroid.

The x-coordinate of the centroid is given by the average of the x-coordinates of the vertices:

x-coordinate of centroid = (x-coordinate of A + x-coordinate of B + x-coordinate of C) / 3

                      = (-4 + -1 + 2) / 3

                      = -3 / 3

                      = -1

The y-coordinate of the centroid is given by the average of the y-coordinates of the vertices:

y-coordinate of centroid = (y-coordinate of A + y-coordinate of B + y-coordinate of C) / 3

                      = (-5 + 2 + -4) / 3

                      = -7 / 3

Therefore, the centroid of the triangle with vertices A(-4, -5), B(-1, 2), and C(2, -4) is (-1, -7/3).

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The observation when clicking and dragging the vertices of a triangle is that changing the positions of the vertices alters the shape and size of the triangle.

When the vertices of a triangle are moved, the angles and side lengths of the triangle may change. As a result, properties such as the area, perimeter, and type of triangle (e.g., equilateral, scalene, isosceles) may also change.

This interactive exercise allows for hands-on exploration of how manipulating the vertices of a triangle affects its characteristics. It helps in developing an intuitive understanding of the relationship between the vertices and the resulting properties of the triangle.

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To calculate the mass of the wire c with density (x, y) = xy, where c: r(t) = 4t i + 3t j with 0 ≤ t ≤ 2, we need to integrate the product of the density function and the magnitude of the velocity vector along the curve.

The wire c is represented by the parametric equation r(t) = 4t i + 3t j, where i and j are the unit vectors in the x and y directions, respectively, and t is the parameter.

To calculate the mass of the wire, we need to integrate the product of the density function (x, y) = xy and the magnitude of the velocity vector |r'(t)| along the curve.

The velocity vector r'(t) is obtained by differentiating r(t) with respect to t. In this case, r'(t) = 4i + 3j.

The magnitude of the velocity vector |r'(t)| is given by √(4^2 + 3^2) = √25 = 5.

The integral for calculating the mass is given by:

M = ∫[0,2] (density function) * |r'(t)| dt

  = ∫[0,2] xy * 5 dt

  = 5 ∫[0,2] xy dt.

To evaluate this integral, we need additional information about the density function, such as its relationship to the position vector r(t). Without knowing the specific form of the density function, we cannot determine the exact value of the mass of the wire.

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a. John's indifference map would show a preference for combinations of eggs and toast where the ratio of toast to eggs is 3:2.

b. Xi's indifference map would show an equal preference for different combinations of bread and chocolate, as she is neutral about bread but views chocolate as a good.

c. Ramesti's indifference map would show perfect substitution between tickets to the opera and baseball games, indicating that he is equally satisfied with either option.

d. Ahmad's indifference map would show a diminishing marginal utility for chocolate bars, where his satisfaction decreases after consuming a certain number of chocolate bars in a day.

which is because:

John's indifference map would consist of curves or lines that represent combinations of eggs and toast where the ratio of toast to eggs is 3:2. Each curve or line represents a different level of satisfaction or utility for John. As he moves further away from his preferred ratio of 3:2, his satisfaction decreases.

Xi's indifference map would show straight lines or curves that represent combinations of bread and chocolate where she is indifferent between different combinations. Since she views chocolate as good and is neutral about bread, the lines or curves would be parallel to the chocolate axis, indicating that she values chocolate more than bread.

Ramesti's indifference map would consist of straight lines that represent perfect substitution between tickets to the opera and baseball games. Any combination of tickets along a line would provide the same level of satisfaction for Ramesti, indicating that he is willing to trade one ticket for the other at a constant rate.

Ahmad's indifference map would show a downward-sloping curve that represents diminishing marginal utility for chocolate bars. As he consumes more chocolate bars in a day, the curve would become flatter, indicating that the additional satisfaction he derives from each additional chocolate bar decreases. This reflects his dislike for chocolates after consuming a certain quantity.

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i. there are 214 families who watch at least one platform.

ii. there are 71 families who watch exactly one platform.

To find the number of families who watch at least one platform, we need to add up the number of families who watch each platform individually and subtract the number of families who watch all three platforms.

i. The number of families who watch at least one platform:

= (Number of families who watch Netflix) + (Number of families who watch Hulu) + (Number of families who watch Amazon Prime video) - (Number of families who watch all three platforms)

[tex]= 123 + 124 + 110 - 143[/tex]

[tex]= 214[/tex]

Therefore, there are 214 families who watch at least one platform.

ii. The number of families who watch exactly one platform can be found by adding up the number of families who watch each platform individually and subtracting the number of families who watch more than one platform.

ii. The number of families who watch exactly one platform:

= (Number of families who watch Netflix) + (Number of families who watch Hulu) + (Number of families who watch Amazon Prime video) - 2 * (Number of families who watch all three platforms)

[tex]= 123 + 124 + 110 - 2 * 143= 71[/tex]

Therefore, there are 71 families who watch exactly one platform.

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As per given utility function, Tane will accept any job as long as the job comes with a certain payment of at least $40,000 (approx.).

Tane's utility function, [tex]U(W)=W^{0.5}[/tex], indicates that he has a concave utility function, implying diminishing marginal utility of wealth. This means that Tane values each additional dollar of wealth less as his wealth increases.

Considering the job offer with a base salary of $30,000 and a potential $70,000 bonus with a 0.5 probability, we can calculate the expected value of this salary scheme. The expected value is calculated as the sum of each possible outcome multiplied by its respective probability:

Expected Value = (0.5 * $30,000) + (0.5 * $100,000) = $65,000

Since the expected value is less than $80,000 (approx.), which is the minimum certain payment Tane would accept, Tane would not accept the job offer with the probabilistic salary scheme.

However, Tane's utility function indicates that he values certainty in income. As long as the job comes with a certain payment of at least $40,000 (approx.), Tane would prefer to accept the job because the certain payment guarantees a minimum level of income, providing him with a higher level of certainty and potentially higher utility compared to the probabilistic salary scheme. Therefore, Tane will accept any job as long as the job comes with a certain payment of at least $40,000 (approx.).

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Answer:

False. The magnitude of a vector is always non-negative.

The area of the sector bounded by the 95° arc is approximately 379.94 square feet

To find the area of a sector bounded by a given arc, we need to know the radius and the central angle of the sector.

Given:

Radius (r) = 24 feet

Central angle (θ) = 95°

The formula to calculate the area of a sector is:

Area = (θ/360°) * π * r^2

Substituting the values into the formula:

Area = (95/360) * π * (24^2)

Area = (19/72) * π * 576

Area ≈ 379.94 square feet

Therefore, the area of the sector bounded by the 95° arc is approximately 379.94 square feet.

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To find the equation of the parabola that passes through the given points, we can use the general form of a quadratic equation, which is [tex]y = ax^2 + bx + c[/tex]. By substituting the coordinates of the points into this equation, we can form a system of equations and solve for the values of a, b, and c.

Let's start by substituting the coordinates (0, 5) into the equation:

[tex]5 = a(0)^2 + b(0) + c\\5 = c[/tex]

Now, let's substitute the coordinates (2, -3) into the equation:

[tex]-3 = a(2)^2 + b(2) + c\\-3 = 4a + 2b + 5[/tex]

Finally, let's substitute the coordinates (-1, 12) into the equation:

[tex]12 = a(-1)^2 + b(-1) + c[/tex]

12 = a - b + 5

We now have a system of three equations:

1) 5 = c

2) -3 = 4a + 2b + 5

3) 12 = a - b + 5

From equation 1), we know that c = 5. Substituting this into equations 2) and 3) gives us:

-3 = 4a + 2b + 5

12 = a - b + 5

Simplifying equation 2), we get:

4a + 2b = -8

Simplifying equation 3), we get:

a - b = 7

Now, we can solve this system of equations to find the values of a and b.

Multiplying equation 3) by 2, we have:

2a - 2b = 14

Adding this equation to equation 2), we get:

4a + 2b + 2a - 2b = -8 + 14

6a = 6

a = 1

Substituting the value of a into equation 3), we have:

1 - b = 7

-b = 6

b = -6

So, we have found the values of a = 1 and b = -6. We already know c = 5.

Therefore, the equation of the parabola that passes through the given points is: [tex]y = x^2 - 6x + 5[/tex].

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The average daily balance at the end of the month will be $1,000.00 (option C).

To calculate the average daily balance, we need to determine the total balance over the 30-day period and divide it by the number of days (30) to get the average.

The daily balance for the first 10 days is $500, for the next 10 days is $1,000, and for the last 10 days is $1,500.

To find the total balance, we can multiply each daily balance by the number of days it was held:

Total balance = (10 days * $500) + (10 days * $1,000) + (10 days * $1,500)

Total balance = $5,000 + $10,000 + $15,000

Total balance = $30,000

Now we divide the total balance by the number of days (30) to find the average daily balance:

Average daily balance = Total balance / Number of days

Average daily balance = $30,000 / 30

Average daily balance = $1,000

Therefore, the average daily balance at the end of the month will be $1,000.00 (option C).

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