Question

Question deleted

Answer 1

volume of a cylinder
V= h.pi.r^2
375 = h*3.14*9
h = ?

Answer 2

"Using derivatives to approximate small changes"
sounds like "differentials" to me. Are you familiar with differentials and how to obtain them, given a function?

Sounds as though you need a function for the volume of this beverage can, and that you treat the height, h, as a variable and the area of the base, Pi*r^2, as a constant: