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Can you help me with these questions(No explanation needed) 9. A rectangular hole is to be cut in a wall for a vent. If the

Can you help me with these questions(No explanation needed)

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9. A rectangular hole is to be cut in a wall for a vent. If the perimeter of the hole is 48 in. and the length of the diagonal is a minimum, what are the dimensions of the hole? 10. Some type of phenomena occurs at x = 0 for the function f (x) = coshx - x sinx. f(0) is a(n) A. maximum B. minimum C. inflection D. undefined

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