Two parallel sides of a rectangle are being lengthened at the rate of 2in/sec, while the other two sides are shortened in such a way that the figure remains a rectangle with a constant area of 50 sq in. What is the rate of change of its diagonal when the length of an increasing side is 5in? a. -4 in/sec b. -2.68 in/sec c. 4.47 in/sec d. 4 in/sec e. none

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