3 years ago

Solve with elimination

Mathematics

1 answer:

Fittoniya [83]3 years ago

4 0

I'm pretty sure this is correct

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A building engineer analyzes a concrete column with a circular cross section. The circumference of the column is 18 \pi18π18, pi

Whitepunk [10]

Answer:

$A=81\pi $ m^2$

Step-by-step explanation:

Circumference of the column $=18\pi $ meters$

Circumference of a circle $=2\pi r$

Therefore:

$2\pi r =18\pi $ meters\\2r=18\\r=18 \div 2\\$Radius, r=9 meters$

Area of a Circle $=\pi r^2$

Since radius of the cross section of the column =9 meters

Area of the cross section of the column

$=\pi *9^2\\=81\pi $ m^2$

5 0

3 years ago

186 = 6 (3n + 7) answer for N

Vesnalui [34]

N=8 is the correct answer

7 0

2 years ago

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Solve the following equation. Round solution to the tenths place. 29 = с/7.2 C =

expeople1 [14]

Answer:

c = 208.8

Step-by-step explanation:

a. $\frac{c}{7.2} =29$ To solve for C, you need to get the variable on one side of the equation and the numbers on the other side of the equation.

b. $\frac{c}{7.2} =29$ You need to move the 7.2 to the other side. So, multiply both sides by 7.2, because it's being divided, so multiplying will cancel it out.

c: $c = 29 * 7.2$ Then, multiply 7.2 by 29. (The * symbol means multiply)

d. c. = 208.8 The answer is 208.8, which is rounded to the tenths place.

Hope this helps! I tried to explain it in detail. :)

7 0

3 years ago

Hey people! Guess what? I need help :D Attached is a picture that has the problem please explain how you did it!

damaskus [11]

Answer:

1.07

Step-by-step explanation:

because 13 divided by 13.91 is 1.07

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2 years ago

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Evaluate the expression 9. 225

goblinko [34]

The answer is 3/15..

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3 years ago