144. Use the formula for the volume of a cone, since the answer is in terms of pi disregard the pi in the formula and solve using (r^2)(h/3) which will give you the answer in terms of pi.
To work out 7% of 600, this is what you do
7/100 x 600
this will give you your answer
7% of 600 = 42
Assuming the cube is closed, you can use the divergence theorem:
where is the surface of the cube and is the region bounded by .
We have
so the flux is 0.
total cost = .25m + 25d
M is the number of miles driven and D is the number of days the car was rented