find the area of a regular octagon with a radius of 20​

Answers

Answer 1

1325.5

im not too sure, but i think that is the answer.

Answer 2

Answer:

Area   = 2 x Sqrt (2) x r^2

Area = 2 x sqrt(2) x 20^2

Area = 2 x 1.414  x 400

Area = 1131.37

Step-by-step explanation:


Related Questions

a number is rolled once and then rolled again. What is the probability of rolling a 3 followed by rolling a 6?

Answers

Answer:

2

Step-by-step explanation:

because if you multiply 3 by 2 it gives you six\

Answer:

the answer is 3-6

Step-by-step explanation:

A football team tries to move the ball forward as many yards as possible on each play, but sometimes they end up behind where they started. The distances, in yards, that a team moves on its first five plays are 2, 21, 4, 3, and 25. A positive number indicates moving the ball forward, and a negative number indicates moving the ball backward. 1). Which number in the list is the greatest? 2). What is a better question to ask to find out which play went the farthest from where the team started? 3). The coach considers any play that moves the team more than 4 yards from where they started a "big play." Which play(s) are big plays?

Answers

Answer:

Given:

The distances, in yards, that a team moves on its first five plays are 2, 21, 4, 3, and 25.

Solved:

1. The greatest number is 25

2. If the moved distances are square, which one is largest?

3. The move which is greater than 4 is considered "big play"

=> 21 and 25 are big play (21 > 4, 25 > 4)

Hope this helps!

:)

two integers that multiply to -20 and add to 1

Answers

Answer:

-4 and 5

Step-by-step explanation:

Answer: 5 and -4

Step-by-step explan

if there are 5 apples to every 3 oranges in a bin which graph represents the proportional relationship of the fruit in the bin

Answers

Answer:

the graph can be x-y=2

Step-by-step explanation:

Answer:

The answer is D

Step-by-step explanation:

I took the test

also you should show the graph so that people who didnt take the test can also answer

(o゚v゚)ノ

What is the y- intercept of the graph shown that is below

Answers

Answer:

B

Step-by-step explanation:

The y- intercept is the point on the y- axis where the line crosses it

This point is y = 2

with coordinates (0, 2 ) → B

The line is  crossing the y axis at (0,2)

What is intercept ?

The x - intercept is where a line crosses the axis and the y intercept is the point where  the line crosses the y - axis .

observing the graph it can be concluded that ,

The line is  crossing the y axis where x = 0 and y = 2 , so the point is (0,2)

correct answer is c) (0,2)

Learn more about intercept

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A company has found that the number of items sold, x, depends upon
the price, p at which they're sold, according the equation
X=14400-3p^2

The price has been increasing by $2 per month. Find the rate at which
revenue is changing when the price is $40. Note: the answer might be
negative

Answers

Answer: -$480

Step-by-step explanation:

The revenue us P*x

now, when P = $40, we have:

X = 14400 - 3*40^2 = 9600

then the revenue is:

9600*$40 = $384000

now, the price increaces by $2 so the new equation is:

X = 14400 - 3*42^2 = 9108

The revenue is:

9109*$42 = $382536

You can see that the revenua is smaller than before.

Now, if we want to calculate the rate of change when p = $40, we need to look at X'(40)

this is:

X´(p) = -3*2*p

then:

X'(40) = -3*2*40 = -120

Theh rate of change of the revenua will be:

X'(40)*$40 = -120*$40 = -$480

can net worth be negative?

Answers

Answer:

our net worth can tell you many things. If the figure is negative, it means you owe more than you own. If the number is positive, you own more than you owe. ... Negative net worth does not necessarily indicate that you are financially irresponsible; it just means that – right now – you have more liabilities than assets

Step-by-step explanation:

hope it help

Yes, of course.  A good fraction of the people on earth owe more than they own, so have negative net worth.  

In the USA about 14% of the households have negative net worth.  I would have guessed that credit card debt was the culprit, but it's mostly student loans that drag folks into this category.

Write the expression – 5x(4 + 3x) using words.

the sum of negative five times a number and four minus three times the number

the product of negative five times a number and the quantity four plus three times the number

the product of three times a number plus the quantity four and five times the number

Answers

Answer:

the product of negative five times a number and the quantity four plus three times the number

Step-by-step explanation:

Answer:

The second one

Step-by-step explanation:

Melanie earned $39 at her job when she worked for 3 hours. What was her hourly pay
rate in dollars per hour? Express your answer in simplest form.

Answers

Answer:

13

Step-by-step explanation:

To find the unit pay

you first had to do 39/3 (39 divided by 3) and then that answer you get is payment she receives in an hour

hour: 1  |   3

Pays: 13|  39

HOPE IT HELPS:)

What is the area of the base

Answers

The are of the base is 32 in^2. Since is 4 times 8

Prove that DJKL~ DJMN using SAS Similarity Theorem. Plot the points J (1,1), K(2,3), L(4,1) and J (1,1), M(3,5), N(7,1). Draw DJKL and DJMN.

Answers

Answer and Step-by-step explanation: The triangles are plotted and shown in the attachment.

SAS Similarity Theorem is by definition: if two sides in one triangle are proportional to two sides of another triangle and the angles formed by those sides in each triangle is congruent, the triangles are similar.

For the triangles on the grid, we know that ΔJKL and ΔJMN have a congruent angle in J as shown in the image. To prove they are similar, we find the slope of sides KL and MN:

Slope of KL:

slope = [tex]\frac{y_{K} - y_{L} }{x_{K} - x_{L} }[/tex]

slope = [tex]\frac{3-1}{2-4}[/tex]

slope = -1

Slope of MN:

slope = [tex]\frac{y_{N} - y_{M} }{x_{N} - x_{M} }[/tex]

slope = [tex]\frac{1-5}{7-3}[/tex]

slope = -1

Since the slopes of KL and MN are the same and the angle is congruent, we can conclude that ΔJKL~ΔJMN.

Angelica started with half a tank of gas in her car, and she used of that. Write an equation in the text box. Solve to show how much of a full tank she used.

Answers

Ans

Step-by-step explanation:

Let one full tank = x

Then by the given statement, Angelica started with x/2

Suppose she used half of that, then,

x/4. So that x/4 - x/2 = x/4

This implies that she travelled half the distance she would have, using a full tank.

Suppose her destination requires 3 full tanks, then she would stop three times for a refill.

Two gongs strike at intervals of 24 and 40minutes respectively. At twist time will they strike together again if they start simultaneously at 12 noon? Hint: 60 minutes = 1 hour

Answers

Answer:

They will sound together at 2pm

Step-by-step explanation:

Now, the first thing we need to calculate is , in how many minutes will the two gongs strike together.

To be able to do this, we need to calculate the least common multiple of the two numbers 24 and 40

The lowest common multiple between both is 120

This means that the two gongs will sound together at exactly 120 minutes

Now since 1 hour is 60 minutes, this means that 120 minutes will be = 120/60 = 2 hours

Since they both sounded together at 12 noon and the next time they will be sounding is next two hours, their sounding time will thus be 12 noon + 2 hours = 2 pm

The expression two square root of three minus square root of 27 is equivalent to

Answers

Answer:

-0.954(rounded)

Step-by-step explanation:

first write it in number form

√2(3)-√27

the exact form will be 3√2-3√27 = -0.954(rounded)

It’s rounded to 0.954

How would I solve this? Can I get steps?

Answers

Answer:

p = ± q / 5r + 8; Option D

Step-by-step explanation:

We are given the following equation; q^2 / p^2 - 16p + 64 = 25r^2;

q^2 / p^2 - 16p + 64 = 25r^2 ⇒ Let us factor p^2 - 16p + 64, as such,

p^2 - 16p + 64,

( p )^2 - 2 * ( p ) * ( 8 ) + ( 8 )^2,

( p - 8 )^2 ⇒ Now let us substitute this into the equation q^2 / p^2 - 16p + 64 = 25r^2 in replacement of p^2 - 16p + 64,

q^2 / ( p - 8 )^2 = 25r^2 ⇒ multiply either side by ( p - 8 )^2,

q^2 = 25r^2 * ( ( p - 8 )^2 ) ⇒ divide either side by 25r^2,

q^2 / 25r^2 = ( p - 8 )^2 ⇒ Now apply square root on either side,

| p - 8 | = √( q^2 / 25r^2 ) ⇒ Simplify,

| p - 8 | = q / 5r,

| p | = q / 5r + 8,

Answer; p = ± q / 5r + 8; Option D

What is the distance between (-3, 4) and (-3, 10)?

Answers

Answer:

6 is the the distance between the points

The required distance between coordinates (-3, 4) and (-3, 10) is 6 units.

Given that,
The distance between the coordinates (-3, 4) and (-3, 10) is to be determined.

What is coordinate?

Coordinate, is represented as the values on x - axis and y - axis of the graph. where the values of the x-coordinate are called abscissa and the values of y coordinate are called ordinate.

Let the distance between two points be C.
Tio determined the distance between two points [tex](x_1, y_1)[/tex] and ([tex]x_2,y_2[/tex]) is given by the distance formula
C = √(x_1-x_2)^2(y_1-y_2)^2}

Putting the given coordinate in the above formula.

C = (-3+3)^2+(4 -10)^2}
C = {(0)^2+(6)^2}
C = √36
C = 6

The required distance between points is 6 units.

Thus, the required distance between coordinates (-3, 4) and (-3, 10) is 6 units.

Learn more about coordinate here:

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On a coordinate plane, a circle has a center at (4, 5) and a radius of 3 units.
Which equation represents a circle with the same center as the circle shown but with a radius of 2 units?

(x – 4)2 + (y – 5)2 = 2
(x – 4)2 + (y – 5)2 = 4
(x – 5)2 + (y – 4)2 = 2
(x – 5)2 + (y – 4)2 = 4

Answers

Answer:

(x - 4)² + (y - 5)² = 4

Step-by-step explanation:

The equation of a circle in standard form is

(x - h)² + (y - k)² = r²

where (h, k) are the coordinates of the centre and r is the radius

Here (h, k) = (4, 5) and r = 2, thus

(x - 4)² + (y - 5)² = 2², that is

(x - 4)² + (y - 5)² = 4 ← second option on list

The required equation represents a circle with the same center as the circle shown but with a radius of 2 units is (x-4)^2  + (y-5)^2 = 4

Equation of a circle

The standard equation of a circle is expressed as:

(x-a)^2  + (y-b)^2 = r^2

where:

(a, b) is the centre = (4, 5)

r is the radius = 3 units

Substitute to have;

(x-4)^2  + (y-5)^2 = 2^2

(x-4)^2  + (y-5)^2 = 4

Hence the required equation represents a circle with the same center as the circle shown but with a radius of 2 units is (x-4)^2  + (y-5)^2 = 4

Learn more on equation of circle here: https://brainly.com/question/14150470

What is the circumference of the circle? Use 3.14 for pi r=6.4 cm circle

Answers

So the right answer is of option B.

Look at the attached picture

Hope it will be helpful to you..

Good luck for your test...

When Zeke and Jackson were running their group physics experiment, for each measurement needed they both recorded observation and then averaged the results. This was an attempt on their part to reduce the amount of which of the following types of variability?
A) Induced variability
B) Sample variability
C) Measurement variability
D) Natural variability

Answers

The answer is D. Please study for yourself and your future this is easy, you just need shift your focus on studying
D) natural variability !! hope this helps :)

Enrique collected 7 more than 2 times as many recyclable bottles as Natasha. Write an expression for the number of bottles they collected altogether

Answers

Answer:

12

Step-by-step explanation:

because 7x2 is 12

Answer:

3n+7

Step-by-step explanation:

Let's say the variable n stands for how many recyclable bottles Natasha collected.

Enrique collected 7 more than double of what Natasha has.

SO

2n+7

We also need to include Natasha's share

(2n+7) + n

OR 3n+7

La suma de dos números es 135 y su diferencia 37, hallar los dos números

Answers

Answer- 86 and 49

Step-by-step explanation: 86+49=135

                                              86-49=37

What is the range? 5,10,5,4,5,10,3,10
Help me pls

Answers

Answer: the answer is 7

Step-by-step explanation: the lowest number is 3 and the biggest one is 10 so you substract 10-3 and you get 7

Answer:

7.

Step-by-step explanation:

In order to find the range, you need to:

1. Arrange the set of numbers in order from smallest to largest.

2. Identify the smallest and largest numbers in the set.

3. Subtract the smallest number from the largest.

Therefore, your answer is 7.

Happy to help. :)

If A = (-1,-3) and B = (11,-8), what is the length of AB?
O A. 12 units
OB. 14 units
C. 11 units
O D. 13 units

Answers

Answer:

the answer to this question is D. 13 units.

Step-by-step explanation:

for this problem you use the distance formula

d equals the square root of (the second x minus the first x and rise all to.the second power minus the second y minus the first y that is rised to the second power too)

Maria está en el piso 6 y quiere ir al sótano 2. Cuantos pisos bajará?

Answers

Answer: 8

Step-by-step explanation:

Ella tiene que bajar los 6 pisos, mas 2.

6+2=8

can someone help me plzzzzzzzzzzzzzzzzzzzzzzzzz it's for 10 poits

Answers

Answer:

Step-by-step explanation:

3^2 + 4^2 = 5 ^2

in right triangle. c is always the longest

Answer:

[tex]3^{2} +4^{2}+ 5^{2}[/tex]

Step-by-step explanation:

Which relation is a function?

Answers

Answer:

A.

Step-by-step explanation:

You can tell if it has a function or not by the x-axis/domain. It does not matter if the y-axis/range has the same number, but if the x-axis has the same number then that would not be a function. Hope this helps!

What is the slope of a trend line that passes through the points (5, 80) and (7 65)?
15
0
о
O
o

Answers

Answer:

15/2 = 7.5

Step-by-step explanation:

The slope is found by

m = (y2-y1)/(x2-x1)

    = (65-80)/(7-5)

    = -15/-2

   = 7.5

Answer:

-15/2

Step-by-step explanation:

Write the equation of the line that passes through the point (-4,-9) and has a slope 1/2

Answers

Answer:

y=1/2x-7

Step-by-step explanation:

-9=1/2(-4)+b

-9=-2+b

b=-7

y=1/2x-7

Which dimensions cannot create a triangle? a three sides measuring 6 cm, 8 cm, and 10 cm b three angles measuring 40 degrees, 70 degrees, and 65 degrees c three angles measuring 10 degrees, 25 degrees, and 145 degrees d three sides measuring 9 m, 15 m, and 9 m

Answers

Answer:

A,C,D are triangles, B is not.

Step-by-step explanation:

Let 3 sides of a triangle be a,b,c.

A triangle have the sum of 3 angles = 180 degree

and

a-b<c<a+b (similar for a and b)

a. three sides measuring 6 cm, 8 cm, and 10 cm

Satisfied the a-b<c<a+b property -> triangle

b. three angles measuring 40 degrees, 70 degrees, and 65 degrees

Total of 3 angles = 40+70+65 = 175 > 180

-> not triangle

c. three angles measuring 10 degrees, 25 degrees, and 145 degrees

Total of 3 angles = 10+25+145 = 180

-> triangle

d. three sides measuring 9 m, 15 m, and 9 m

Satisfied the a-b<c<a+b property -> triangle

Answer:

C

All triangle must equal 180, 40 + 70 + 65 = 175


Find the values of θ at which there are horizontal tangent lines on the graph of r = 1 + cos θ.

Answers

Answer:

θ = π/3 and 5π/3

Step-by-step explanation:

x = r cos θ and y = r sin θ.  Therefore:

dy/dx = (dy/dθ) / (dx/dθ)

dy/dx = (r cos θ + r' sin θ) / (-r sin θ + r' cos θ)

In this case, r = 1 + cos θ and r' = -sin θ.

dy/dx = ((1 + cos θ) cos θ + (-sin θ) sin θ) / (-(1 + cos θ) sin θ + (-sin θ) cos θ)

dy/dx = (cos θ + cos²θ − sin²θ) / (-sin θ − sin θ cos θ − sin θ cos θ)

dy/dx = (cos θ + cos²θ − (1 − cos²θ)) / (-sin θ (1 + 2 cos θ))

dy/dx = (cos θ + 2 cos²θ − 1) / (-sin θ (1 + 2 cos θ))

The tangent line is horizontal when the numerator of dy/dx is 0 and the denominator of dy/dx is not 0.

0 = 2 cos²θ + cos θ − 1

0 = (cos θ + 1) (2 cos θ − 1)

cos θ = -1 or 1/2

θ = π/3, π, 5π/3

0 = -sin θ (1 + 2 cos θ)

sin θ = 0 or cos θ = -1/2

θ = 0, 2π/3, π, 4π/3

Therefore, the answer is θ = π/3 and 5π/3.

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