No6&7

6. Use the definition to find the slope of the tangent to the graph of the function f(x) = - 1 7 at x = 5. X a. 125 b. 25 C. -125 2 d. 125 e. 25 7. The height (in feet) of a certain kind of tree is approximated by h(t) = - 160 1 + 220 -0.31 Where t is the age of the tree in years. Estimate the age of a 60-ft tree. Round your answer to the nearest hundredth. years