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31. The surface area of an inflating weather balloon is described by A(x) = 4x2 - 1 where x is the number of seconds and

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31. The surface area of an inflating weather balloon is described by A(x) = 4x2 - 1 where x is the number of seconds and A is measured in L. a) Determine the average rate of change between 3 and 9 sec. (3 marks) b) Determine the instantaneous rate of change at 5 seconds using the difference quotient

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