Find the area of of a regular octagon with side length 20 cm.

Answers

Answer 1

A=2(1+[tex]\sqrt{2}[/tex])a^2=2·(1+[tex]\sqrt{2}[/tex])·20^2≈1931.37085cm²


Related Questions

The Hiking Club is taking another trip. The hike leader's watch shows that they gained 296 feet in altitude from their starting position.
Their altitude is now 285 feet, but there is no record of their starting altitude.
Write and solve an equation to represent this situation and find their starting altitude.

Answers

Answer: altitude at starting point is -11ft or 11ft below sea level
Step-by-step explanation:
Equation for this situation will be
A = Ag - 11
A = actual altitude
Ag = altitude gained.
At starting point, altitude gained is zero, therefore;
A = 0 - 11
A = -11ft

Answer:

Step-by-step explanation:

The required equation is x+295=285 , where x= starting altitude( in feet).

The starting altitude is -11 feet.

Let x be the starting altitude( in feet) .

Given: The Hiking Club is taking another trip. The hike leader's watch shows that they gained 296 feet in altitude from their starting position.

Then, the altitude is now = x+ 296

Since their altitude is now 285 feet.

So the required equation is x+296=285

Subtract 296 from both sides, we get

x= -11

which is is the principal value of sin -1 ( 1 )

Answers

Answer:

-0.01745240644 according to my calculator

A system of equation is shown below.

2x + 3y = 34

y = 5x

What is the value of x + y ?

Answers

Answer: 29

Step-by-step explanation:

2 + 3 = 5

34 = 5 = 29

Which equation describes the line with the slope 2/3 that passes through the given point on the graph?

Answers

Answer: y=2/3x-2

Step-by-step explanation:

Slope intercept form is: y=mx+b

m=slope

b= y-intercept

slope is 2/3

What is the slope of a line perpendicular to the line whose equation is x+3y=-12

Answers

Answer: 3

Step-by-step explanation:

Find slope of that line which is -1/3x-4

then flip its sign and the equation to get 3

I’ll give 35 points and brainliest answer asap please it’s due tomorrow

Answers

Answer:

try 72.2

Step-by-step explanation:

surface area is 3.8x3.8x6

but minus one side is 3.8x3.8x5 = 72.2

Answer:

72.2 square meters

Step-by-step explanation:

multiply the length by the width

3.8 x 3.8 = 14.44

in a cube there are 6 sides; however, it says Sarah is painting all the sides except for one so she is only painting 5 sides

14.44 x 5 = 72.2

Find the next number in the pattern.
4, 6, 11, 19, 30, ______

Answers

Answer: 44

Step-by-step explanation:

kaylee Bryant purchased taz software that regularly sells for 74.95 but is on sale for 59.95​

Answers

Answer:

well that is 15$$ off

Step-by-step explanation:

Find angle 1 pleasee :)

Answers

Answer:

its the one on the right side

Answer:the one on the right side

Step-by-step explanation:

This Question: 1 pt
17 of 29
Emma has $160 cash to spend at a music store. How much can she spend on items if there is a 7% sales tax?
Emma can spend on items.
(Round to the nearest cent as needed.)

Answers

Answer:

i would say $148.80

Step-by-step explanation:

tax would amount to 11.20 so when you subyract that from the total then the rest is what she can spend.

5th grade math. correct answer will be marked brainliest

Answers

Answer: 1 1/4

5/4

Step-by-step explanation:

[tex]\frac{1}{2} + \frac{3}{4}[/tex]  (im assuming its 3/4)

make 1/2 into 2/4 so its easier to add

2/4 + 3/4 = 5/4 or 1 1/4


A video game system and several games are sold for $616. The cost of the games is 3 times as much as the cost of the system. Find the cost of the system and the cost of the games.
Cost of the video game system s


Answers

S+3S=616. 4S=616 616/4=$154=S

How many solutions does the equation 6a − 3a − 6 = −2 + 3 have?

Two
None
One
Infinitely many

Answers

Answer: There is only one solution

6a - 3a - 6 = -2 + 3

3a - 6 = 1

3a = 7

divide 4 questions ​

Answers

Answer:

huh

Step-by-step explanation:

is 29.6 = 29.600 true or false???

Answers

Answer:

true

Step-by-step explanation:

this is the decimal helps shorten up 29.600

true
just simplify the two numbers

Please help me with my hw thank you so much

Answers

Answer: d

Step-by-step explanation:

Help

Find x. Round to the nearest tenth.
I
64
8

Answers

Answer:

x= 3.5 (nearest tenth)

Step-by-step explanation:

Please see the attached picture for the full solution.

Which of the equations below could be the equation of this parabola?
(0,0)
Vertex
A. y = 1/4x²
B. x = 1/4y²
C. y = -1/4x²
D. x= -1/4y²

Answers

Answer:

B. x = 1/4y²

Step-by-step explanation:

The equation of a parabola is x = 1/4y². Therefore, option B is the correct answer.

What is the parabola?

A parabola refers to an equation of a curve, such that a point on the curve is equidistant from a fixed point, and a fixed line. The fixed point is called the focus of the parabola, and the fixed line is called the directrix of the parabola.

From the graph,

x-intercept(s): (0,0)

y-intercept(s): (0,0)

Vertex is (0, 0)

Directrix, x=-1

Here, the axis of symmetry is y=0

So, the equation is x = 1/4y²

Therefore, option B is the correct answer.

To learn more about the parabola visit:

https://brainly.com/question/21685473.

#SPJ7

Maths question is very hard

Answers

yeah it is hardddd.

Answer:

I cant quite see the question or understand what your asking.

If your right I’ll mark brainiest

Answers

Step-by-step explanation:

π is an irrational number

Answer:

c) [tex]\sqrt{35}[/tex]

d) [tex]\pi[/tex]

e) 0.[tex]\frac{}{54}[/tex]

Step-by-step explanation:

An irrational number is a number that cannot be expressed as a fraction for any integers. In this case, the answers above cannot.

Given the geometric sequence tn with t1=96 and r=−1/4, find t4.

Give your answer as a fraction, if necessary. Do not include "t4=" in your answer. For example, if you found t4=9, you would enter 9.

Answers

Answer:

3/2

Step-by-step explanation:

Given

[tex]t_1 = 96[/tex]

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

Required

Find t4

The nth term of a geometric sequence is calculated as:

[tex]t_n = t_1 * r^{n-1[/tex]

So:

[tex]t_4 = t_1 * r^{4-1[/tex]

[tex]t_4 = t_1 * r^3[/tex]

This gives:

[tex]t_4 = 96 * \frac{1}{4}^3[/tex]

[tex]t_4 = 96 * \frac{1}{64}[/tex]

Express as a single fraction

[tex]t_4 = \frac{96}{64}[/tex]

[tex]t_4 = \frac{3}{2}[/tex]

Hence, the 4th term is 3/2

Simplified 1100/2500

Answers

Answer:

11/25

Step-by-step explanation:

we can divide both top/bottom by 100, to get 11/25

:)

Use the Distributive Property to
REWRITE 2/3(x - 9)

Answers

Answer:

2/3x-6

Step-by-step explanation:

There are 20 pieces of fruit in a basket and 12 of them are oranges. What percentage of the pieces of fruit in the basket are oranges? Show your work in the box and circle your answer

Answers

Answer:60 percent

Step-by-step explanation: You have fraction the two numbers which will be 12/20 them you times it by 100 which equals 60 oranges.

is 1.3 million bigger than 65 million

Answers

Answer:

no

Step-by-step explanation:

because 1.3m is small

and 65M is very big I need 65m

Please help due soon.

Answers

In 3.2 hours because 120 240 360 480 so at 3.2 it would be at 390

help? :’) on math:

Which equation would you use to solve the following situation?

If everybody on the team scores 6 points, and the team has a total of 42 points, how many people are on the team?

1. 6 p = 42
2. 7 p = 42
3. 6 + p = 42
or 4. 42 - p = 6

what number ??

Answers

Answer:

yeppy the answer should be 1. 6p=42 :)

Please help me! I need help finding this slope.

Answers

Answer:

4/-9

Step-by-step explanation:

you have decided to give your best friend a bag of
red and green marbles for his birthday. your friend
likes green marbles better than red ones, so the
bag has twice as many green marbles as red. The
label on the bag says it lcontains a total of 84 marbles.
How many green marbles are in the bag? Write a
System of equations for this problem. Then solve the
problem using any method you like. Be sure to check
your solutions

Answers

Answer:

There are 28 red marbles and 56 green marbles in the bag.

Step-by-step explanation:

Let's define:

R = number of red marbles in the bag.

G = number of green marbles in the bag.

We know that:

"There is a total of 84 marbles in the bag"

Then we can write this as:

R + G = 84

"The bag has twice as many green marbles as red marbles"

Then:

G = 2*R

So we have two equations:

R + G = 84

G = 2*R

This is the system of equations we need to solve.

To solve this, we usually start by isolating one of the variables in one of the equations, here we can see that G is already isolated in the second equation, then we can ignore the first step.

Now that we have an isolated variable, we can replace it in the other equation, then we can replace the second equation in the first one to get:

R + G = 84

R + (2*R) = 84

3*R = 84

R = 84/3 = 28

This means that there are 28 red marbles in the bag.

Now we can use the equation:

G = 2*R

To find the number of green marbles, where we need to replace R y 28, then we get:

G = 2*28 = 56

Which means that there are 56 green marbles.

Can someone help me? I’ll reward points + brainalist

Answers

Answer:2) B. 303) B. a triangle with measurements of 2, 3 and 5 inches .

Step-by-step explanation:

2) 85° = (3x - 5)° [Vertically Opposite Angles]

=> 3x - 5 = 85

=> 3x = 85 + 5

=> 3x = 90

[tex] = > x = \frac{90}{3} [/tex]

=> x = 30

Hence,

Required value of x is 30

3) B. a triangle with measurements of 2, 3 and 5 inches

AS,

Here,

2 + 3 = 5.

And according to Triangle Inequality Property measurement of any two sides of the triangle should be greater than the third side.

So a triangle can't be made.

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