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5. [-/1 Points] DETAILS TANAPMATH7 11.5.042. MY NOTES PRACTICE ANOTHER Find the average value of the function f over the interval [0, 2]. f ( x ) = 50-x Need Help? Read It Submit Answer 6. [-/1 Points] DETAILS TANAPMATH7 11.5.050. MY NOTES PRACTICE ANOTHER Depreciation: Double Declining-Balance Method Suppose a tractor purchased at a price of $50,000 is to be depreciated by the double declining-balance method over a 10-year period. It can be shown that the rate at which the book value will be decreasing is given by R(t) = 12288.61e-0.23914t (0