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Given a closed rectangular box with dimensions L feet by W feet by H feet. Assume that L is increasing at the rate of 4

Given a closed rectangular box with dimensions L feet by W feet by H feet. Assume that L is increasing at the rate of 4 ft/hr., W is decreasing at the rate of 6 ft/hr ., and H is increasing at the rate of 3 ft/hr. If L = 5ft, W = 4 ft, and H = 6 ft, at what rate is the box's

a) surface area changing?

b) volume changing?

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