A cylinder has radius of 3 units and the volume 721 cubic units. What is the height of the cylinder?
A) V8 units
B) 8 units
C) 12 units
D) 24 units

At the beginning of the year, adrian's savings account balance was \$28$28. each week, he deposits another \$15$15 into that account, and he doesn't spend any of his savings. is his savings account balance proportional to the number of weeks since the start of the year?