Calculus:

Problem 4. (1 point) A rectangular storage container with an open top is to have a volume of 28 cubic meters. The length of its base is twice the width. Material for the base costs 12 dollars per square meter. Material for the sides costs 4 dollars per square meter. Find the cost of materials for the cheapest such container. Total cost = (Round to the nearest penny and include monetary units. For example, if your answer is 1.095, enter $1.10 including the dollar sign and second decimal place.)\fProblem 6. (1 point) 7 Let f(x)de = 4, f(x)dx = 7, f()de = 8. 2 4 Find f(x)dx = and (4f(x) - 7)de = Note: You can earn partial credit on this