## Godlovesme one year ago HELP ASAP PLEASE!!!!! :(((((( Pyramid A is a square pyramid with a base side length of 18 inches and a height of 9 inches. Pyramid B has a volume of 3,136 cubic inches. How many times bigger is the volume of pyramid B than pyramid A? Give your answer as a percent. Provide an explanation and proof for your answer to receive full credit.

1. Godlovesme

v= a^2 * h/3 or v= 1/3 * b * h im not sure which formula i have to use :/

2. Godlovesme

3. Godlovesme

4. anonymous

Does it really matter which formula?

5. Godlovesme

um you'll get different answer so i guess it does

6. anonymous

Not really. a^2 is the same as b. Since a is side length and b is base area. And area of a square is side squared. And 1/3 * h is the same as h/3. In this situation, it would be easier to use the first though imo.

7. Godlovesme

if u use the first formula, you'll get 972 but if u use the 2nd one they you'll get 54 :/

8. Godlovesme

then*

9. anonymous

Ok. The only difference is that the second formula is used when you have the BASE AREA and the first is used when you have the BASE SIDE LENGTH. The formulas themselves will get you the same thing, the only difference is the amount of steps. In the first formula, you'd just plug in 18 and 9 and calculate, while in the second, you'd find the base (18^2) and then multiply by 3. Both get the same result though.

10. Godlovesme

ohh so which one do i use in this case? sorry im bad at this .-.

11. anonymous

You have the BASE SIDE LENGTH, so you'd use the first.

12. Godlovesme

okay so it's gonna be 972 cuz v= 18^2 * 9/3 v= 324 * 3 v= 972

13. anonymous

Yes. The volume will be 972 in^3

14. Godlovesme

yay! :) so what's the next step? :)

15. anonymous

$\frac{3136}{972}$ Dividerino

16. Godlovesme

3.226 since it's asking me for percentage, do i multiply it by 100?

17. anonymous

Yeah.

18. Godlovesme

okay thank you soo much !! i really appreciate your help thanks! :)))

19. anonymous

No problem :)

20. Godlovesme

(: