Question: 8. A box with a square base is open at the top. If 75 square feet of material are used, what is the maximum volume

8. A box with a square base is open at the top. If 75 square feet of material are used, what is the maximum volume possible for the box? 9. (a) The radius r of a sphere is increasing at a rate of 8 inches per minute. Find the rate of change of the volume V when the diameter is 16 inches. Hint: V = -71' 4 3 (b) Find the derivative of y = xx

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