If n = number of hours and the equation is 174 + 58n then the answer is 3 hours
174 = 58n
÷ 58
3 = n
The answer of x=7, because 7+2=9
The volume of a sphere is given by the equation
, where V is the volume and r is the radius.
To answer this question, simply plug the correct values into the equation:

The volume of the air in the balloon is about 113.0976 in3.
Hope this helps!!