A closed square bottomed rectangular box will be constructed out of two types of materials. h W W The material for the vertical sides costs 5 dollars per square foot and the material for the top and bottom costs 7 dollars per square foot. (a) If the total cost of building the box is C dollars, which of the following equations represents the total cost of building the box? Note - 14wh + 20w2 = C O 5wh + 7w2 = C O 20wh + 7w2 = C O 20wh + 14w2 = C 40wh + 14w2 = C (b) Use your answer in part (a) to express the volume of the box in terms of w. Your answer will also have C in it. V(W) =