Question

NEED HELP ASAP

Answer 1

So basically we need to find the volume of this cone-shaped building first.

The formula for the volume of a cone:
$V = \pi r^{2}\frac{h}{3}$

Where r is the radius and h is the height.

1.) Plug in 11.4 for h because 11.4 is the height:
$V = \pi r^{2} \frac{11.4}{3}$

2.) The diameter is 12, and the radius is just half of that. So the radius is 6. Plug in 6 for r because 6 is the radius:
$V = \pi 6^{2} \frac{11.4}{3}$

3.) Plug in 3.14 for π because the directions told you to:
$V = 3.14*6^{2} * \frac{11.4}{3}$

4.) Simplify:
$V = 3.14 * 36 * 3.8$

5.) Simplify further:
V = 429.552

So the volume of the building is 429.552 meters cubed. 
If 1 cubic meter = $20, how much money will 429.552 cubic meters cost?

Multiply 429.552 on both sides:
1 cubic meter (*429.552) = $20 (*429.552)

429.552 cubic meter = $8591.04

That means that 429.552 cubic meters will cost a total of $8591.04 :)