Subtract 10 and divide by 7
If x =-5 then you put -5 in place of x.
y=-5+7
y=2
<span>2x + x = 420
3x = 420
x = 140 Adult tickets </span>
The volume of a cylinder with a radius r and a height h:

The volume of a cone with a radius r and a height h:

Therefore

We have 
Substitute:

Answer: The volume of a cone is equal 10.75 in³