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7. Find the exact xvalue where the function f(1') = .r + In (1:3 _ 1) attains a maximum value. An estimated answer or a calculator answer will not earn any credit. 8. Using the Mean Value Theorem and Rolle's Theorem, show thatr3 + _1' _ 1 = 0 has exactly one real root. 9. Iff(l) = 10 and f'(at) 2 2for1 S r S 4, how small canf(4) possibly be? 10. The graph of a function is given below. Determine the intervals on which the function is concave up and concave down