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74. An open box is to be made from a square piece of cardboard of dimensions 30 inches by 30 inches by cutting out squares of area x^2 from each corner.
a. Express the volume V of the box as a function of x.
b. State the domain of V.
Each side of the square would look like x--------x, if the length started out as 30 inches, then each side would be 30-2x.
The height is x.
Length and width are the same because it has a square base.
b.Each dimension has to be greater than 0.
x>0 and 30-2x>0
is the domain.
Interval notation: (0,15in)