How do you do this Maths question?

Answer:

3.5g/cm³ to 1d.p

Step-by-step explanation:

Density = mass/volume

Mass = 416g

Volume = 12 x 5 x 2 (length x width x height)

Volume 120cm³

Density = 416g/ 120cm³

Denaity = 3.47g/cm³

By answering the above question, we may state that we have assumed equation that the prerequisites for inference using a confidence interval have been satisfied.

A math equation is a mechanism for connecting two claims by using the equals sign (=) to indicate equivalence. A mathematical statement that establishes the equivalence of two mathematical expressions is known as an equation in algebra. The equal symbol, for example, splits the numbers 3x + 5 and 14. A mathematical formula can be used to describe the relationship between two phrases written on opposite sides of a letter. The logo and programme are frequently the same. 2x - 4 Equals 2, for example.  

Sample Size: The sample size should be large enough to guarantee that the mean sampling distribution is roughly normal. There is no hard and fast rule regarding what makes a "big enough" sample size, although a sample size of at least 30 is regarded sufficient. The sample size for both men and women is fewer than 30 in this situation.

We may proceed with generating a 95% confidence interval to estimate the difference between men and women in the mean number of days for the duration of stay at a hospital since we have assumed that the prerequisites for inference using a confidence interval have been satisfied.

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the cost of a VCR that sold for $1,389.88 in 1981 would be $3,686.12 in today's dollars, adjusted for inflation.

To calculate the cost of a VCR in today's dollars based on its cost in 1981, we need to adjust for inflation using the Consumer Price Index (CPI).

We need to find the CPI for the year 1981 and the current year. For example, let's say the CPI for 1981 is 98.3 and the CPI for the current year is 260.5.

Inflation rate = (Current year CPI / 1981 CPI) x 100

Inflation rate = (260.5 / 98.3) x 100

Inflation rate = 265.17

This means that the general price level has increased by 265.17% since 1981.

To find the cost of the VCR in today's dollars, we multiply its cost in 1981 by the inflation rate:

Cost in today's dollars = Cost in 1981 x (Inflation rate / 100)

Cost in today's dollars = $1,389.88 x (265.17 / 100)

Cost in today's dollars = $3,686.12 (rounded to the nearest cent)

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Answer:

You need to know the total number of coins that was in her purse to answer this question.

Answer:

2, -7, 3 are your answers! :).

Step-by-step explanation:

The opposite of a positive would be it's negative form, and the opposite of a negative would be it's positive form.

Answer:

[tex] \sf \: y = - 1[/tex]

Step-by-step explanation:

Now we have to,

→ Find the required value of y.

The equation is,

→ -4(y - 2) = 12

Then the value of y will be,

→ -4(y - 2) = 12

→ -4(y) - 4(-2) = 12

→ -4y - (-8) = 12

→ -4y + 8 = 12

→ -4y = 12 - 8

→ -4y = 4

→ y = 4 ÷ (-4)

→ [ y = -1 ]

Hence, the value of y is -1.

The correct answer is option (B) 3/8 for the probability based on given tree diagram.

The tree diagram shows all possible outcomes when flipping three coins. To find the probability of one coin landing on tails and two coins landing on heads, we need to find all the outcomes where this occurs.

From the tree diagram, we can see that there are three outcomes where one coin lands on tails and two coins land on heads: (H, H, T), (H, T, H), and (T, H, H).

Therefore, the probability of one coin landing on tails and two coins landing on heads is the sum of the probabilities of these three outcomes:

P(one tail, two heads) = P(H, H, T) + P(H, T, H) + P(T, H, H)

Using the multiplication rule of probability, we can see that each of these outcomes has a probability of (1/2) * (1/2) * (1/2) = 1/8.

Therefore, the probability of one coin landing on tails and two coins landing on heads is:

P(one tail, two heads) = 1/8 + 1/8 + 1/8 = 3/8

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1) The unfolded shape of solid is called the net of the solid. The net of square pyramid is present in above figure 2. Area of square pyramid is equals to 224 mm².

2) The number of boxes that fit into back of Nico’s truck is equals to the 135.

We have a pyramid with a square base and triangular faces, as shown in Figure 1 above. Length of the base of the pyramid, b = 8 mm

Height of the pyramid, h = 10 mm

The net of the square pyramid is a plan view of each face and of the square base and its dimensions. Square pyramid (5 faces), i.e., 4 triangular levels and 1 square level. Square pyramid net has total 5 unfolded faces. So, required net of square pyramid present above. Now, Surface area of square pyramid is equals to sum of area of base square and area of 4 triangular faces. So, first we determine area of base square = b² , where 'b' is side of square. Here, b =8mm so, square area A₁ = 8² = 64 mm²

Also, area of a Triangle = (1/2)× base× height

so, area of triangle = (1/2)× 8×10 = 40 mm²

Area of 4 triangular faces of pyramid, A₂

= 4× 40 = 160 mm²

Therefore, Surface area of square pyramid present above = A₁ + A₂

= 64 mm² + 160 mm² = 224 mm²

2) We have a truck with dimensions.

Length of back of Nico’s truck, l = 9.5 feet

Width of back of Nico’s truck, w = 6 feet

Height of back of Nico’s truck, l = 8 feet

He has several boxes of important papers and he wants to hold in the back of truck. The shape of each box of papers is cube. The dimensions that is side of each cube = 1.5 feet

We have to determine the number of boxes of papers Nico will pack into the back of his truck.

The volume of the truck = Length ×Width × Height = l×w×h

so, volume of the Nico’s truck = 9.5 feet × 6 feet × 8 feet = 456 feet³

Volume of box of papers ( cube) = (side)³

= (1.5 feet )³ = 3.375 feet³

Number of boxes that fit into back of truck = volume of truck/ volume of each cubic box = 456 feet³/3.375 feet³

= 456/3.375 = 135.11 ~ 135

Hence, the required number of boxes are 135.

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Complete question :

1. Consider the above pyramid, figure 1.

(a) Draw and label a net for the pyramid.

(b) Determine the surface area of the pyramid. Show your work.

(Pyramid is listed in the pdf)

2. The back of Nico’s truck is 9. 5 feet long, 6 feet wide, and 8 feet tall. He has several boxes of important papers that he needs to move. Each box of papers is shaped like a cube, measuring 1. 5 feet on each side. How many boxes of papers can Nico pack into the back of his truck? Show your work.

Please help!

Answer:

25 pounds of cashews and 15 pounds of pistachios.

Step-by-step explanation:

Helping in the name of Jesus.

Answer:

15 pounds of pistachio and 25 pounds of cashews

Step-by-step explanation:

By the given information, we can make a system of equations: Pistachio + Cashew = 40

If we multiply the price of each to the weight, we get 10 cashews + 6 pistachio = 340 pounds. We can use this system of equations to find the amount of each nut.

Answer:

8a + 32

Step-by-step explanation:

Distributive Property is a next level kind of multiplication.

The 8 on the outside of the parenthesis is being multiplying times the (a+4).

So you bounce that 8 into the parenthesis and times it to both the a and the 4.

8a + 8•4

= 8a + 32

see image.

The inverse οf f(x) is y = -2 - √[(x + 5)/3]

Tο find the inverse οf a functiοn, we can swap the pοsitiοns οf x and y and sοlve fοr y.

Starting with f(x) = 3(x + 2)² - 5:

y = 3(x + 2)² - 5

Swap x and y:

x = 3(y + 2)² - 5

Sοlve fοr y:

x + 5 = 3(y + 2)²

(x + 5)/3 = (y + 2)²

±√[(x + 5)/3] = y + 2

y = ±√[(x + 5)/3] - 2

Since x ≤ -2, we can οnly use the negative square rοοt tο ensure that y is a functiοn. Therefοre, the inverse οf f(x) is y = -2 - √[(x + 5)/3]

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From the problem, the minimum height of the tunnel that Jamie's van must be able to pass through is 12.5 m.

We can approach this problem by determining the minimum width and height of the tunnel that Jamie's van must be able to pass through. If her van is able to fit through these minimum dimensions, then it should be able to pass through the entire tunnel.

Let's start with the width of the tunnel. Since Jamie cannot cross the middle line due to heavy oncoming traffic, her van must fit entirely within her own lane. Therefore, the width of the tunnel must be at least equal to the width of her van, which is 2.5 m.

Next, let's consider the height of the tunnel. At its highest point, the tunnel is 8 m tall. However, Jamie's van is 5 m tall. To pass through the tunnel, the van must fit under the lowest point of the tunnel that is at least 5 m above the ground. We can use the shape of the parabolic tunnel to determine the minimum height that Jamie's van can pass through.

The shape of a parabolic curve is given by the equation y = ax^2, where y is the height, x is the distance from the center of the curve, and a is a constant that determines the steepness of the curve. In this case, we can use the fact that the tunnel is 8 m wide at its base to determine the value of a.

At the center of the tunnel (x = 0), the height is 8 m. Therefore, we have:

8 = a(0)^2

a = 8

Substituting this value of a into the equation for the parabolic curve, we have:

y = 8x^2

To determine the minimum height that Jamie's van can pass through, we need to find the value of x that corresponds to the edge of her van. Since her van is 2.5 m wide, this corresponds to a distance of 1.25 m from the center of the lane.

Substituting x = 1.25 into the equation for the parabolic curve, we have:

y = 8(1.25)^2

y = 12.5

Therefore, the minimum height of the tunnel that Jamie's van must be able to pass through is 12.5 m.

Since the height of the tunnel is greater than the height of Jamie's van, she should be able to pass through without any problems. However, she should still exercise caution and be mindful of the height and width of her vehicle when driving through narrow spaces.

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the husband can reject the null hypothesis and conclude that his guess about the probability of changing the diaper when the baby cries is statistically significant at the 5% level if the LR exceeds 3.84.

what is probability?

Probability is a measure of the likelihood or chance of an event occurring. It is a quantitative measure that ranges from 0 (indicating impossibility) to 1 (indicating certainty).

a) The null hypothesis (H0) from the husband's perspective is that the true probability of the baby crying for a diaper change is equal to the wife's claim, i.e., θ = 0.3. The alternative hypothesis (Ha) is that the true probability is different from the wife's claim, i.e., θ ≠ 0.3.

(b) To perform a likelihood ratio test, we first calculate the maximum likelihood estimates of the parameters under the null and alternative hypotheses.

Next, we calculate the likelihood ratio statistic:

LR = (L(0.5)/L(0.3))^20

where L(0.5) and L(0.3) are the likelihoods of the data under the alternative and null hypotheses, respectively.

Simplifying, we get:

LR = (0.5/0.3)^20 = 4.19

To find the rejection region, we compare the LR with the critical value of the chi-squared distribution with 1 degree of freedom at the desired significance level (α). Let's assume a significance level of α = 0.05.

The critical value for this test is approximately 3.84. Thus, the rejection region is:

LR > 3.84

Therefore, the husband can reject the null hypothesis and conclude that his guess about the probability of changing the diaper when the baby cries is statistically significant at the 5% level if the LR exceeds 3.84.

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The measure of angle J is 51.3 degrees (rounded to the nearest tenth).

We can use the Pythagorean theorem to find the length of the hypotenuse KJ of the right triangle KIJ. The Pythagorean theorem states that for a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides. Therefore, we have:

KJ² = KI² + IJ²

Substituting the given values, we get:

KJ² = 4² + 2²

KJ²= 20

Taking the square root of both sides, we get:

KJ = √20 = 2√5

Now, we can use the definition of cosine to find the measure of angle J

cos(J) = 2 / (2√5)

Simplifying the expression, we get:

cos(J) = √5 / 5

Taking the inverse cosine of both sides, we get:

J = cos⁽⁻¹⁾(√5 / 5)

We find that the inverse cosine of √5 / 5 is approximately 51.3 degrees. Therefore, the measure of angle J is 51.3 degrees (rounded to the nearest tenth).

The cosine of an angle in a right triangle equals the adjacent side divided by the hypotenuse.

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There is no definitive answer to whether the variables have positive correlation, negative correlation, or no correlation.

What is a negative correlation?

A negative correlation is a relationship between two variables in which they move in opposite directions. This means that when one variable increases then the other variable decreases. In statistical terms, a negative correlation is indicated by a negative correlation coefficient, which measures the strength and direction of the relationship between two variables.

Now,

The correlation between the number of doctors on staff at a hospital and the number of administrators on staff can vary depending on the specific circumstances of the hospital.

In general, one might expect that as the number of doctors on staff increases, the demand for administrative support may also increase. In this case, we would expect a positive correlation between the number of doctors and administrators.

On the other hand, if the hospital is focused on reducing costs and improving efficiency, it may choose to reduce administrative staff while maintaining the same number of doctors. In this case, we would expect a negative correlation between the number of doctors and administrators.

Therefore, there is no definitive answer to whether the variables have positive correlation, negative correlation, or no correlation, as it depends on the specific context and factors influencing the hospital's staffing decisions.

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Measurement is the act of comparing an object's properties to a standard quantity. It is crucial in determining an object's quantity.

For instance, to measure the height of a tin, one must measure the vertical distance from the base to the top.

The measurement must be in millimeters, and a ruler is the most suitable tool.

To do this, place the ruler vertically with point 0 at the baseline of the tin, mark the point where the ruler coincides with the top, and read the height to the nearest millimeter.

To measure the height of a tin in millimeters, follow these steps:

Obtain a ruler that has millimeter markings.

Place the tin upright on a flat surface.

Position the ruler vertically with its zero point aligned with the base of the tin.

Carefully move the ruler up or down until it reaches the top edge of the tin.

Read the measurement value at the point where the ruler aligns with the top edge of the tin.

Record the height measurement in millimeters to the nearest whole number.

For example, if the measurement value is 65.5 millimeters, then the real height of the tin in millimeters is 66 millimeters (rounded to the nearest whole number).

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List the procedure to measure the height of a tin in mm and write the real height in mm

The nearest whole number when rounding to the nearest metre forces us to choose 3, which is the case here as 2.51 is closer to 3 than it is to 2.

The digits in a numerical value known as significant figures, sometimes known as significant digits, are those that show how precisely the measurement was made. The degree of precision of the measuring device used to perform the measurement determines the number of significant figures in the measurement.

We must round the height restriction to the closest metre in order to show it on the sign because it is specified as 2.51 metres.

We look at the digit in the tenths place, which is 5, to round to the closest metre. We round up the number to the next one since 5 is more than or equal to 5, which is 1. Thus, 3 m should be listed as the maximum height.

This is due to the fact that picking the nearest whole number when rounding to the nearest metre forces us to choose 3, which is the case here as 2.51 is closer to 3 than it is to 2.

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Answer:

x= -12, 5

Step-by-step explanation:

im so sorry for the late response it has been a whirlwind for me with trying to graduate with school lately

zeros of a function is when f(x) is equal to zero

with the graph we can see that -12 and 5 are where f(x) is equal to zero so these are the zeros of the function

we can find this out with the equation too like this

first we find the square of the function by finding a factors of -60 that will also add to be 7

12 and -5 are 2 factors

(12)(-5)= -60

12+ -5=7

now we can use this to make 2 equations

(x+12)(x-5)=0

x+12=0

x= -12

x-5=0

x=5

I hope this helps and isn't too confusing

Answer:

a) 9.42 in

b) 47.1 sq. inches

Step-by-step explanation:

[tex]\sf \bf \theta = 54^\circ\\\\diameter = 20 \ in\\\\r = 20 \div 2\\\\r = 10 \ in[/tex]

a) Length of arc:

         [tex]\boxed{\bf Lenght \ of \ arc = \dfrac{\theta}{360}*2\pi r}[/tex]

                                    [tex]= \dfrac{54}{360}*2*3.14*10\\\\= 9.42 \ in[/tex]

b) Area of sector:

            [tex]\boxed{\bf Area \ of \ sector = \dfrac{\theta}{360}*\pi r^2}[/tex]

                                         [tex]\bf = \dfrac{54}{360}*3.14*10*10\\\\= 47.1 \ in^2[/tex]

keeping in mind that perpendicular lines have negative reciprocal slopes, let's check for the slope of the equation above

[tex]y=\stackrel{\stackrel{m}{\downarrow }}{\cfrac{5}{3}}x-3\qquad \impliedby \qquad \begin{array}{|c|ll} \cline{1-1} slope-intercept~form\\ \cline{1-1} \\ y=\underset{y-intercept}{\stackrel{slope\qquad }{\stackrel{\downarrow }{m}x+\underset{\uparrow }{b}}} \\\\ \cline{1-1} \end{array} \\\\[-0.35em] ~\dotfill[/tex]

[tex]\stackrel{~\hspace{5em}\textit{perpendicular lines have \underline{negative reciprocal} slopes}~\hspace{5em}} {\stackrel{slope}{ \cfrac{5}{3}} ~\hfill \stackrel{reciprocal}{\cfrac{3}{5}} ~\hfill \stackrel{negative~reciprocal}{-\cfrac{3}{5} }}[/tex]

so we're really looking for the equation of a line whose slope is -3/5 and it passes through (5 , -2)

[tex](\stackrel{x_1}{5}~,~\stackrel{y_1}{-2})\hspace{10em} \stackrel{slope}{m} ~=~ - \cfrac{3}{5} \\\\\\ \begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-\stackrel{y_1}{(-2)}=\stackrel{m}{- \cfrac{3}{5}}(x-\stackrel{x_1}{5}) \implies y +2= -\cfrac{3}{5} (x -5) \\\\\\ y+2=-\cfrac{3}{5}x+3\implies {\Large \begin{array}{llll} y=-\cfrac{3}{5}x+1 \end{array}}[/tex]

The probability that the wedding planner will have too many pollotarian meals is 0.998.

To calculate this, we can use the binomial probability formula. The binomial probability formula is used to calculate the probability of obtaining a certain number of successes in a certain number of trials. In this case, the number of trials is the total number of guests, and the number of successes is the number of guests who are pollotarian.

The formula is: P(x) =[tex]nCx * p^x * (1-p)^(n-x)[/tex], where n is the number of trials, x is the number of successes, and p is the probability of success.In this case, n = 300, p = 0.03, and x = 9. Plugging these numbers into the formula, we get: P(x) = [tex]300C9 * 0.03^9 * (1-0.03)^(300-9)[/tex] = 0.998.

Therefore, the probability that the wedding planner will have too many pollotarian meals is 0.998, or 99.8%.

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In order to map polygon ABCDE onto polygon A'B'C'D'E', a series of transformations must be performed. A common method of transforming a figure is to use a combination of translations, reflections, rotations, and dilations.

Transformation of a figure is the process of changing the shape, size, position or orientation of a 2D or 3D shape. This can be done using various techniques such as translations, rotations, reflections and enlargements. The transformation of a figure can help to visualize the change and understand the different properties of the shape. It can also be used to solve mathematical problems.

A transformation is a process in which a figure is changed in size, shape, or position.

A translation is a transformation that moves a figure in any direction. To move polygon ABCDE to polygon A'B'C'D'E', one must translate the figure to the right, left, up, or down.

A reflection is a transformation that flips a figure over a line, called the line of reflection. To reflect the figure onto the new polygon, the line of reflection must be chosen.

A rotation is a transformation that turns a figure around a point, called the center of rotation. To rotate the figure onto the new polygon, the center of rotation must be chosen.

A dilation is a transformation that changes the size of a figure. To scale the figure onto the new polygon, the scale factor must be chosen.

After the transformations are applied to the original figure, it will be mapped onto the new polygon. The combination of transformations must be chosen carefully in order to achieve the desired result.

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The equation expressing the visible area an of the sheet of paper in terms of the number of times it has been folded n is a = 93.5/2^n.

Every time a sheet of paper is folded in half, the visible area is reduced by half. If the original area of the sheet of paper is A, then after the first fold, the visible area is A/2. After the second fold, the visible area is (A/2)/2 = A/4. In general, after n folds, the visible area is A/[tex]2^n[/tex].

In this problem, the original area of the sheet of paper is given as 93.5 square inches. Therefore, the equation expressing the visible area a of the sheet of paper in terms of the number of times it has been folded n is a = 93.5/[tex]2^n[/tex]. As the number of folds increases, the visible area of the sheet of paper decreases rapidly, approaching zero as n approaches infinity.

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Answer:

Step-by-step explanation:

these functions are both straight lines with a slope of 1

f(x) = x      passes through the origin (0,0)

h(x) = x-4      is parallel to f(x) = x    and passes through the y axis at (0, -4) and is below the line f(x) = x

Answer:

[tex]\frac{1}{4}[/tex]

Step-by-step explanation:

The simpliest way to find a slope of a graph such like this is to find what we call the "rise" and "run"

Find two points on the graph that match with the grid in the background. Two points on this graph that can represent this example is (-3, 1) and (0, 2)

Start at the left-most point [-3, 1 in this case] and go up until you match the same y-axis as your second point. Then, go right until you meet said point. From (-3, 1) to (0, 2) you go up once, and then right four times. This results in the fraction 1/4

The angle x is approximately equal to option (c) 49 degrees

Sine is a trigonometric function that relates the ratios of the sides of a right triangle. Specifically, the sine of an angle in a right triangle is defined as the ratio of the length of the side opposite the angle to the length of the hypotenuse. In other words, sin(X) = opposite / hypotenuse.

Since the sine function is periodic, there can be multiple angles that have the same sine value. In general, for any angle X, sin(X) = sin(180° - X), which means that the sine of an angle and its supplement have the same value.=

Therefore, it's important to specify the range of the angle we're interested in when finding the inverse sine function, which gives us the unique angle in the range of -90° to 90° that has the specified sine value.

sin⁻¹(0.7547) ≈ 49°

Therefore, the correct option is (c) 49 degrees

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The centroid (C) of the upper half of the circle is, C = (x_c, y_c) = (-2a/3π, 4a/3π)

We can find the centroid of the upper half of the circle by using integration. Let's denote the upper half of the circle as a function of x:

y = f(x) = sqrt(a^2 - x^2)

To find the centroid (C) of this region, we need to find the coordinates (x_c, y_c) such that:

x_c = (1/A) × ∫(a, -a) x*f(x) dx

y_c = (1/A) × ∫(a, -a) [F(x) - f(x)] dx

where A is the area of the upper half of the circle and F(x) is the equation of the circle.

First, let's find A:

A = ∫(a, -a) f(x) dx

= (1/2) × ∫(a, -a) sqrt(a^2 - x^2) dx

= (1/2) × [a^2 × sin^(-1)(x/a) + x × sqrt(a^2 - x^2)]_a^(-a)

= (1/2) × [a^2 × π + 0 - (-a^2 × π) + 0]

= πa^2/2

Next, let's find x_c:

x_c = (1/A) × ∫(a, -a) x×f(x) dx

= (2/πa^2) × ∫(a, 0) x × sqrt(a^2 - x^2) dx

(Note: We only integrate from 0 to a because the function f(x) is symmetric about the y-axis)

Let u = a^2 - x^2

Then du/dx = -2x, and dx = -du/(2x)

So the integral becomes:

(2/πa^2) × ∫(0, a^2) [(a^2 - u) × sqrt(u)] × (-du/(2x))

= -(1/πa^2) × ∫(0, a^2) sqrt(u) du

= -(1/πa^2) × [(2/3) × u^(3/2)]_0^(a^2)

= -(2/3πa^2) × (a^3)

= -2a/3π

Therefore, x_c = -2a/3π.

Finally, let's find y_c:

y_c = (1/A) × ∫(a, -a) [F(x) - f(x)] dx

= (2/πa^2) × ∫(a, 0) (a^2 - x^2) dx

(Note: We only integrate from 0 to a because the function f(x) is symmetric about the y-axis)

= (2/πa^2) × [a^2x - (1/3)x^3]_0^a

= (2/πa^2) × [(2/3)a^3]

= 4a/3π

Therefore, y_c = 4a/3π.

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Answer:(9x + 10)(9x - 10)

Step-by-step explanation:

Answer:

The equation of the line with gradient -1 that passes through the point (-3, 0) can be found using the point-slope form of a line. The point-slope form of a line is given by:

y - y1 = m (x - x1)

Where m is the gradient and (x1, y1) is a point on the line.

For this line, m = -1 and (x1, y1) = (-3, 0). Thus, the equation of the line is:

y - 0 = -1 (x - (-3))

y = -x + 3

Answer:

x + y + 3 = 0

Step-by-step explanation:

equation of line ( point slope format)

(y-y1) = m(x - x1)

they had given the point as (-3,0) on comparing with (x1, y1) and substituting the values in equation we get

y = -1(x +3)

final ans

x + y + 3 = 0

Answer:

7

Step-by-step explanation:

(number of sides - 2) x 180 = sum of interior angles

(number of sides - 2) x 180 = 900

Reverse the formula.

900 / 180 = 5

5 + 2 = 7

Therefore, number of sides = 7