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Sav [38]
3 years ago
9

* PLEASE ANSWER TY* You can find the area of a polygon by dividing it into triangle and rectangle sub-parts and adding up their

individual areas. Which of the following is one of the rules of this method? a.) You must use one rectangle and two triangles. b.) You must be able to calculate the area of the triangle and rectangle sub-parts. c.) The polygon must be a regular polygon. d.) The triangles must all be congruent.
Mathematics
1 answer:
Mkey [24]3 years ago
7 0

Answer:

C.)

Step-by-step explanation:

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boyakko [2]
1/10*(f-220) or 0.1(f-220)
6 0
3 years ago
Please help me with this!!! I will mark brainliest!!
wolverine [178]

Hello from MrBillDoesMath!

Answer:

-9 sqrt(5)


Discussion:

-2 sqrt(20) -  sqrt(125) =

-2 *2 sqrt(5) - sqrt(125)=                                as 20 = 4* 5

-4sqrt(5)- 5 sqrt(5)  =                                      as 125 = 25 *5

(-4 -5) sqrt(5) =

-9 sqrt(5)


Thank you,

MrB

8 0
3 years ago
Find y as a function of x if y"' + 9y' = 0, y(0) = 6, y'(0) = 9, y"(0) = 18. y(x) =
Andreas93 [3]

Answer:

y(x) = 8 - 2cos 3x + 3sin 3x

Step-by-step explanation:

Given the equation:

y''' + 9y' = 0

The characteristic equation :

⇒r³ + 9r =0

Solving for r, we get r = 0 and r = ± 3i

The general equation for such equation is :

<u>y = C₁ + C₂cos 3x + C₃sin 3x</u>

Given:

y(0) = 6

Thus, Applying in the above equation, we get

<u>6 = C₁ + C₂ .......................................................1</u>

Differentiating y , we get:

<u>y' = -3C₂sin 3x + 3C₃cos 3x</u>

Given:

y'(0) = 9

Thus, Applying in the above equation, we get

<u>9 = 3C</u><u>₃</u>

or,

<u>C</u><u>₃</u><u> = 3</u>

Differentiating y' , we get:

<u>y'' = -9C₂cos 3x - 9C₃sin 3x</u>

Given:

y''(0) = 18

Thus, Applying in the above equation, we get

<u>18 = -9C</u><u>₂</u>

or,

<u>C</u><u>₂</u><u> = -2</u>

Applying in equation 1 , we get:

<u>C₁ = 8</u>

Thus,

<u>y(x) = 8 - 2cos 3x + 3sin 3x</u>

4 0
3 years ago
0.5(x+0.1)-0.1(x-0.5)
Rom4ik [11]

Answer: 0.4x + 0.1

Step-by-step explanation: Distribution.

0.5(x+0.1)-0.1(x-0.5)

0.5 times x = 0.5x

0.5 times 0.1 = 0.05

First step: 0.5x + 0.05

Distribute next part

-0.1 times x= -0.1x

-0.1 times -0.5 = 0.05

-0.1x + 0.05

Put together: 0.5x + 0.05 -0.1x + 0.05

Combine like terms:

0.5x -0.1x = 0.4x

0.05 + 0.05 = .1

Answer: 0.4x + 0.1

7 0
3 years ago
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30
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3 years ago
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