Round 6 6-7 to the nearest whole number

The graph below shows the amount of money left in the school’s desk fund, f, after d desks have been purchased. for each new desk that is purchased, by how much does the amount of money left in the school’s desk fund decrease?

I'm being volume of cylinder with 13 in. radius and 30 in height answer choices in pic

In the diagram of circle a what is m