a. The change in Shawn's bank account was modeled by the function f(x) = x + 3x. If w represents weeks, determine the rate of change of his bank account using the interval [3,7]. Use the table below to help. f(x) 18 4 28 40 54 70 b. A few weeks later, the change in Shawn's bank account was modeled by the function g(x) = – x° + 200 . If x represents weeks, determine the rate of change of his bank account using the - interval [9, 13].

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