calculus
posted by Jillian .
An open box is to be constructed so that the length of the base is 4 times larger than the width of the base. If the cost to construct the base is 5 dollars per square foot and the cost to construct the four sides is 3 dollars per square foot, determine the dimensions for a box to have volume = 25 cubic feet which would minimize the cost of construction.
height?
dimensions of the base?

didn't I respond to this yesterday
http://www.jiskha.com/display.cgi?id=1302301352