Use the given frequency distribution to find the
(a) class width.
(b) class midpoints of the first class.
(c) class boundaries of the first class.
1) Weight (in pounds)
Class Frequency, f
135 - 139 6
140 - 144 4
145 - 149 11
150 - 154 15
155 - 159 8

Answer: you need to add

Step-by-step explanation: I would ask your teacher to help you understand the lesson.  

The two consecutive natural numbers whose sum of squares is 181 are 9 and 10

Let's assume that the two consecutive natural numbers are x and x+1. Then, we can write an equation based on the given information:

x² + (x+1)² = 181

Expanding the equation:

x² + x² + 2x + 1 = 181

Combining like terms:

2x² + 2x - 180 = 0

Dividing both sides by 2:

x² + x - 90 = 0

Now, we can use the quadratic formula to solve for x:

x = (-b ± √(b² - 4ac)) / 2a

where a = 1, b = 1, and c = -90

x = (-1 ± √(1 + 360)) / 2

x = (-1 ± √(361)) / 2

x = (-1 ± 19) / 2

We discard the negative value, as it does not correspond to a natural number:

x = 9

Therefore, the two consecutive natural numbers are 9 and 10, and their sum of squares is 81 + 100 = 181.

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The percentage of tornadoes that were EF1s is 40%.

What is the percentage?

A figure or ratio stated as a fraction of 100 is called a percentage. The acronyms pct., pct., and occasionally pc are also used to indicate it, however, the percent sign is most frequently used. A % is a number without dimensions and without a standard measurement.

Here, we have

Given: the strengths of tornadoes that occurred in Alabama in 2011.

We have to find the percentage of tornadoes that were EF1s.

EF1s = 58

Total = 145

percentage of tornadoes = 58/145 = x/100

5800/145 = x

x = 40%

Hence, the percentage of tornadoes that were EF1s is 40%.

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Answer:

Step-by-step explanation:

To save for a new car, Trafton invested $5,000 in a savings account that earns 6.5% interest, compounded continuously. After four years, he wants to buy a used car for $7,000. How much money will he need to pay in addition to what is in his savings account?

Answer: 337.5.

Step-by-step explanation:

Answer:

337.5

Step-by-step explanation:

An image of polygon VWYZ has a line of reflection across the x-axis. So option A is correct.

In geometry, the line of reflection is the line over which a figure is reflected. When a point is reflected over a line, it moves the same distance on the opposite side of the line. The line of reflection is perpendicular to the figure at the point of reflection and is equidistant from the figure and its reflection.

A polygon is a closed two-dimensional shape with straight sides. The sides are line segments that intersect only at their endpoints, called vertices. Polygons can have any number of sides, but they must have at least three. Common examples of polygons include triangles, squares, rectangles, pentagons, hexagons, and octagons.

The formula for the line of reflection in a Cartesian coordinate system is:

x = a

where a is the equation of the line of reflection.

This formula represents a vertical line that passes through the point (a, 0) and reflects points across the line of reflection to their corresponding images on the other side.

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Answer:

reflection across x=2

Step-by-step explanation:

the picture should be able to explain itself! :)))

Answer:

2 yards or 6 feet long

Step-by-step explanation:

Each yard is 3 feet long.

If Tanya shortens the leash by 6 feet, that is 2 yards.

4-2=2

The leash is 2 yards (or 6 feet) long.

Answer:

6 foot

Step-by-step explanation:

1 yards = 3 foot

4 yards = 12 foot

We take

12 - 6 = 6 foot

So, the length of the shortened least is 6 foot.

The new triangle A'B'C' after the translation is A'(-3, 3), B'(4, -1), and C'(-2, 0).

A shape is translated when it is moved up, down, left or right without turning. They are congruent if the translated shapes (or the image) seem to be the same size as the original shapes. They have only changed their direction or directions.

To perform the given translation (x, y) → (x − 3, y - 4) on the triangle ABC with vertices A(0, 7), B(7, 3), and C(1, 4), we need to apply the same transformation to each vertex of the triangle and obtain their new coordinates.

For vertex A(0, 7), the transformation gives:

(x, y) → (x − 3, y - 4)

(0, 7) → (0 - 3, 7 - 4)

The new coordinates of A are (-3, 3).

For vertex B(7, 3), the transformation gives:

(x, y) → (x − 3, y - 4)

(7, 3) → (7 - 3, 3 - 4)

The new coordinates of B are (4, -1).

For vertex C(1, 4), the transformation gives:

(x, y) → (x − 3, y - 4)

(1, 4) → (1 - 3, 4 - 4)

The new coordinates of C are (-2, 0).

Therefore, the new triangle A'B'C' after the translation is A'(-3, 3), B'(4, -1), and C'(-2, 0).

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Answer:

3 and -16

Step-by-step explanation:

To find two numbers that add up to 13 but multiply to -48, we can start by making a list of the factors of -48:

1, -1, 2, -2, 3, -3, 4, -4, 6, -6, 8, -8, 12, -12, 16, -16, 24, -24, 48, -48

We can see that the only two numbers in this list whose sum is 13 are 3 and -16. To verify that these numbers multiply to -48, we can simply multiply them together:

3 x (-16) = -48

Therefore, the two numbers that add up to 13 but multiply to -48 are 3 and -16.

Answer: -3, 16

Step-by-step explanation:

The value of tan(R) is 2/3

What is the trigonometric ratio?

The trigonometric functions are real functions that relate an angle of a right-angled triangle to ratios of two side lengths. They are widely used in all sciences that are related to geometry, such as navigation, solid mechanics, celestial mechanics, geodesy, and many others.

using tan (θ) = opposite/Adjacent

Here, tan (R) = opposite/Adjacent

Where: opposite side = 14

Adjacent Side = 21

tan (R) = 14/21  = 2/3

tan (R) = 2/3

Hence, the value of tan(R) is 2/3

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The complete question is in the attached figure:

What is tan(R) =?

Answer:

270 counter clockwise I think I'm not sure though

The surface area of cylinder M is approximately 131.95 square feet and the surface area of cylinder N is approximately 319.77 square feet.

What is a cylinder?

A cylinder is a three-dimensional geometric shape that consists of two congruent parallel bases in the shape of circles or ellipses, and a curved surface that connects the bases. The height of a cylinder is the perpendicular distance between the bases. A cylinder is a type of prism, and it can be classified as either a right cylinder or an oblique cylinder depending on whether or not its axis is perpendicular to its bases. Right cylinders have circular bases and their axis is perpendicular to the bases, while oblique cylinders have elliptical bases and their axis is not perpendicular to the bases.

Now,

Let the radius of cylinder M be r and its height be h. Then, the radius and height of cylinder N are both 2r, since the radius is equal to the height.

Since the cylinders are similar, their dimensions are proportional, which means:

(height of N) / (height of M) = 5/3

(radius of N) / (radius of M) = (2r) / r = 2

Using the formula for the surface area of a cylinder, we can write:

Surface area of cylinder M: 2πr² + 2πrh

Surface area of cylinder N: 2π(2r)² + 2π(2r)(5/3)h

We are told that the surface area of cylinder N is 256 square feet greater than the surface area of cylinder M. So we can set up the equation:

2π(2r)² + 2π(2r)(5/3)h = 2πr² + 2πrh + 256

Simplifying and solving for h, we get:

4r² + 20rh/3 = r² + rh + 128

3r² - rh - 128 = 0

(3r + 32)(r - 4) = 0

Since the height of the cylinder cannot be negative, we take the positive solution r = 4. Then, the height of cylinder M is (3/5)(4) = 12/5, and the height of cylinder N is 2(4) = 8.

Using the formulas for surface area, we can find the surface areas of both cylinders:

Surface area of cylinder M: 2π(4)² + 2π(4)(12/5) = 131.95 square feet

Surface area of cylinder N: 2π(2(4))² + 2π(2(4))(8) = 319.77 square feet

Therefore, the surface area of cylinder M is approximately 131.95 square feet and the surface area of cylinder N is approximately 319.77 square feet.

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Laila: The amount of surplus corn

Thiago: The amount of corn eaten

According to graph the vertical axis of Laila's Graph is surplus popcorn and the vertical axis of Thiago's Graph is popcorn eaten. This can be seen on the graph (graph in image attached below)

Therefore, the correct vertical axis label that accurately represent the situation is:

The amount of surplus popcorn for Laila's graph.

The amount of popcorn eaten for Thiago's graph

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The question is incomplete, complete question in image attached.

Answer:

B

Step-by-step explanation:

the average rate of change of h(x) in the interval [ a, b ] is

[tex]\frac{h(b)-h(a)}{b-a}[/tex]

here the [ a, b ] = [ 4, 8 ] , then

h(b) = h(8) = 3 ← point (8, 3 ) on graph

h(a) = h(4) = 9 ← point (4, 9 ) on graph

then

average rate of change = [tex]\frac{3-9}{8-4}[/tex] = [tex]\frac{-6}{4}[/tex] = - [tex]\frac{3}{2}[/tex]

The log-likelihood function is l(σ) = -n*log(2σ) - sum(|[tex]x_i[/tex]|)/σ.

the moment estimate of σ is σ = 0.

A moment is a quantitative measure of the shape of a probability distribution. Specifically, it is a mathematical calculation that involves taking the product of the distribution's values and certain pre-determined values (such as powers of the variable). Moments are often used to estimate certain parameters of a distribution, such as its mean, variance, or skewness.

Moment estimate of σ:

The kth moment about the origin is defined as E[[tex]X^k[/tex]] = integral from -inf to inf of [tex]x^k[/tex] * f(x) dx.

The first moment about the origin is E[X] = integral from -inf to inf of x * f(x) dx.

E[X] = integral from -inf to inf of x * (1/2σ*[tex]e^{(-|x|/\sigma))[/tex] dx

Let's split the integral into two parts: from -inf to 0 and from 0 to inf.

integral from -inf to 0 of x * (1/2σ[tex]e^{(-|x|/\sigma))[/tex]dx = integral from -inf to 0 of -x * (1/2σ[tex]e^{(-|x|/\sigma))[/tex] dx = 1/2σ * integral from 0 to inf of x * [tex]e^{(-x/\sigma)[/tex] dx

integral from 0 to inf of x * e^(-x/σ) dx is the definition of the gamma function with shape parameter 2 and scale parameter σ, which is Γ(2, σ) = 1 * σ² = σ².

Therefore, E[X] = 1/2σ * σ² = σ/2.

The second moment about the origin is E[X²] = integral from -inf to inf of x² * (1/2σ*[tex]e^{(-|x|/\sigma))[/tex] dx.

E[X²] = 1/2σ * integral from -inf to inf of x² * [tex]e^{(-|x|/\sigma))[/tex] dx

Let's split the integral into two parts: from -inf to 0 and from 0 to inf.

integral from -inf to 0 of x² * (1/2σ [tex]e^{(-|x|/\sigma))[/tex]  dx = integral from -inf to 0 of x² * (1/2σ[tex]e^{(x/\sigma)[/tex]) dx = 1/2σ * integral from 0 to inf of x² * [tex]e^{(-x/\sigma)[/tex] dx

integral from 0 to inf of x² * [tex]e^{(x/\sigma)[/tex]) dx is the definition of the gamma function with shape parameter 3 and scale parameter σ, which is Γ(3, σ) = 2 * σ³.

Therefore, E[X²] = 1/2σ * 2σ³ = σ².

The moment estimate of σ is obtained by solving the equation E[X²] = σ² for σ:

σ² = E[X²] = integral from -inf to inf of x² * (1/2σ*[tex]e^{(-|x|/\sigma)[/tex]) dx

= 1/2σ * integral from -inf to inf of x² * [tex]e^{(-|x|/\sigma)[/tex] dx

= 1/2σ * 2σ³

= σ²

Simplifying the equation, we get:

σ² = σ²/2

Multiplying both sides by 2, we get:

2σ² = σ²

Therefore, the moment estimate of σ is σ = 0.

MLE of σ:

The likelihood function is given by L(σ) = (1/2σ)ⁿ *[tex]e^{(-sum(|x_i|)/\sigma)[/tex], where n is the sample size and [tex]x_i[/tex]are the observed values.

The log-likelihood function is l(σ) = -n*log(2σ) - sum(|[tex]x_i[/tex]|)/σ.

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The equation that models the deposit, y, on day x that Julian makes with an initial deposit of $6 and depositing 2 times as much money as he did the day before is y = 6^2x.

An equation is a mathematical statement of the equality or equivalence of two or more mathematical or algebraic expressions.

Equations use the equation symbol (=), unlike mathematical expressions, which just combine variables, constants, numbers, and values with mathematical operands.

The initial deposit that Julian makes = $6

The amount that he deposits each day = 2x

Let Julian's deposit on day x = y

Let the number of days of deposit = x

y = 6^2x.

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Answer:

1/4

Step-by-step explanation:

because the original recipe makes 96 cookies and you want to make 24 so, we can make an equation and solve for x

96*x=24

x=24/96

x=1/4

so you will only need 1/4 of the ingredients to make 24 cookies

Answer:

4 or 0.25

Step-by-step explanation:

1. Divide 96 by 24:

4

So there are 4 24’s in 96, meaning you can divide the recipe by 4 or multiply it by 1/4

(Example):

4 eggs

2 cups flour

8 cps chocolate chips

Multiply all by 1/4:

4 x 1/4 = 1 cup

2 x 1/4 = 1/2 cup

8 x 1/4 = 2 cup

[tex]\sqrt{363}-3\sqrt{27} ~~ \begin{cases} 363=3\cdot 11\cdot 11\\ \qquad 3\cdot 11^2\\ 27=3\cdot 3\cdot 3\\ \qquad 3\cdot 3^2 \end{cases}\implies \sqrt{3\cdot 11^2}-3\sqrt{3\cdot 3^2} \\\\\\ 11\sqrt{3}-3(3)\sqrt{3}\implies 11\sqrt{3}-9\sqrt{3}\implies 2\sqrt{3}[/tex]

The area of the path is 80 square meters.

Given: A rectangular flower bed measures 10m by 6m. It has a path  2m wide around it.

To Find: The area of the path.

Solution: We need to subtract the area of the inner rectangle from the area of the outer rectangle.

So,

The outer rectangle has dimensions 14m by 10m (adding 2m to each side of the flower bed), so its area is:

A outer = 14m x 10m = 140 m²

Now,

The inner rectangle has dimensions 10m by 6m (the original dimensions of the flower bed), so its area is.

A inner = 10m x 6m = 60 m²

Now,

The area of the path.

A path = A outer - A inner

           = 140 m² - 60 m²

           = 80 m²

Thus, The area of the path is 80 square meters.

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Answer:

2.5 goals/game

Step-by-step explanation:

In order to find the mean we need to find the total of numbers and then divide them by the amount we have.

0,0,1,1,3,3,3,4,5,5

If you add these numbers together you get 25, if you divide 25 by ten then you end up with 2.5

according to the question the given fraction can be solved with equation 1/3 x (15+6) is equal to 7.

To represent a whole, any quantity of equal parts or fractions can be utilised. In standard English, fractions show how many units there are of a particular size. 8, 3/4. Fractions are part of a whole. In mathematics, numbers are stated as a ratio between the numerator compared to the denominator. These can all be expressed as simple fractions as integers. A fraction appears in a complex fraction's numerator or denominator. The numerators of true fractions are smaller than the denominators. A sum that is a fraction of a total is called a fraction. You can analyse something by dissecting it into smaller pieces. For instance, the number 12 is used to symbolise half of a whole number or object.

given,

To evaluate the fraction 1/3 x (15+6), we need to perform the addition inside the parentheses first and then multiply the result by 1/3.

So, 15+6 equals 21.

Then, we can write:

1/3 x (15+6) = 1/3 x 21

Multiplying 1/3 by 21 gives:

1/3 x 21 = 7

Therefore, 1/3 x (15+6) is equal to 7.

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There are 7 books in the stack.

An expression contains one or more terms with addition, subtraction, multiplication, and division.

We always combine the like terms in an expression when we simplify.

We also keep all the like terms on one side of the expression if we are dealing with two sides of an expression.

Example:

1 + 3x + 4y = 7 is an expression.com

3 + 4 is an expression.

2 x 4 + 6 x 7 – 9 is an expression.

33 + 77 – 88 is an expression.

We have,

To find the number of books in the stack, we can divide the total mass of the stack by the mass of each book:

Number of books = Total mass of the stack / Mass of each book

In this case, the total mass of the stack is 21 kilograms, and the mass of each book is 3 kilograms.

Number of books = 21 kg / 3 kg/book

Simplifying the right side, we get:

Number of books = 7 books

Therefore,

There are 7 books in the stack.

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Answer:

To solve a system of equations by graphing, you need to graph each equation on the same coordinate system and find the point where the two lines intersect. If the equations are in slope-intercept form, you can identify the slope and y-intercept and graph them. If one of the equations is in slope-intercept form, you can rewrite the other one in that form and graph them. If both equations are in other forms, you can find the x- and y-intercepts and graph them.

In this case, we have two equations:

y = x + 5

y = -2x - 1

To graph these equations, we can start by finding their intercepts:

y = x + 5

0 = x + 5

x = -5

So the intercept for y = x + 5 is (-5, 0). Similarly,

y = -2x - 1

0 = -2x - 1

x = -1/2

So the intercept for y = -2x - 1 is (-1/2, 0). Now we can plot these points on a coordinate plane and draw a line through each point. The point where these two lines intersect is our solution.

Therefore, the solution to this system of equations is (-3, 2).

Step-by-step explanation:

Answer: 87.3 inches

Step-by-step explanation: The height of the pyramid is the hypotenuse of a right triangle whose legs are the height and half the length of the base.

Let h be the height of the pyramid, then:

h^2 + (21.6/2)^2 = 88.6^2

h^2 + 233.28 = 7857.96

h^2 = 7624.68

h = 87.3 inches (rounded to one decimal place)

Therefore, the height of the stainless steel patio heater is approximately 87.3 inches.

The polynomial function of least degree that has zeros of x=0, x=2i, and x=3, and with all coefficients real is:

Since the zeros of the polynomial function are given as

x=0, x=2i, and x=3,

we can write the function in factored form as follows:

f(x) = a(x-0)(x-2i)(x-3)

where

a is a constant coefficient and the factors correspond to the given zeros.

Since all coefficients must be real, we know that the complex conjugate of 2i, which is -2i, must also be a zero of the function. Therefore, we can rewrite the function as:

f(x) = a(x-0)(x-2i)(x+2i)(x-3)

Expanding this expression gives:

f(x) = a(x² + 4)(x-3)

Multiplying out the brackets and collecting like terms, we get:

f(x) = ax³ - 3ax² + 4ax - 12a

To find the value of 'a', we can use the fact that the coefficient of the x³ term is 1. Thus, we have:

a = 1/(1*4) = 1/4

Substituting this value of 'a' in the above expression, we get:

f(x) = (1/4)x³ - (3/4)x² + x - 3

Therefore, the polynomial function of least degree that has zeros of x=0, x=2i, and x=3, and with all coefficients real is:

Option A: f(x) = x² - 3x³ + 4x² - 12x

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Answer:

9)

[tex]x = 16[/tex]

[tex]y = 8 \sqrt{3} [/tex]

10)

[tex]x = 8[/tex]

[tex]y = 8 \sqrt{2} [/tex]