It may be basic, but I'm just going into Calculus now, so I'm kind of hesitant on where to start.

Question:

An open box is to be made from cutting squares of side

*s* from each corner of a piece of cardboard 25" by 30"

a) Write an expressions for the volume, V(s), in terms of s

b) Draw a graph of V(s)

c) What domain and range make sense in this problem situation?

d) Find the value of s that will give the max volume, and what is the max volume?

e) What value of s will give a volume of 1225 cubic units?

I just need to know how to start it, because I'm just not sure if I should use surface area, area, or derivative or whatnot.