A rectangular package to be sent by a delivery service can have a maximum combined length (y) and girth (perimeter of its cross section) of 300 inches. Assume that the width and height are the same (x). Find the equation for the volume of the box in terms of x alone as an expanded polynomial.

Answer 1

well, you know that the cross-section is x^2 and the length is y, so

v = x^2y
but, you also know that
4x+y = 300

now you can eliminate y.