Answer:
The height of the cone is 
Step-by-step explanation:
we know that
The volume of a cone is equal to

In this problem we have


substitute

simplify

![h=\sqrt[3]{729}\ ft](https://tex.z-dn.net/?f=h%3D%5Csqrt%5B3%5D%7B729%7D%5C%20ft)

Answer:
38 and 108
Step-by-step explanation:
2a + 6b
2 (4) + 6 (5) Plug in values
8+30 = 38
12a + 60
12 (4) + 60 = 108
First, combine 20c and 10c because they are like terms then combine 8d and -5d.
It would look like this:
20c+8d+10c-5d
30c+3d
Hope that helps