Please help me with these problems. I really need it.

Find an equation for each graph shown below. 6-79. b. a. AV d. -27 -17 6-80. The height (h) of a cylinder varies directly with the volume () and inversely with the square of the radius of the base. a. Find an equation for the height in terms of the volume and the radius. Use k to represent the constant of proportionality. b . When the volume is 20 and the radius is 2, the height is 15. Find the height when the radius is 3 and the volume is 10