For the function, f(x)=(9x+7)/(2x+4)
a. Find the critical points or explain, with a derivative, why there are no critical points.
b. Find the x and y coordinates of the absolute maximum and absolute minimum of f(x) in the interval [-10, 7]. Be sure to show all the necessary supporting calculus.
c. Find the x and y coordinates of the absolute maximum and absolute minimum of f(x) in the interval [0, 5]. Be sure to show all the necessary supporting calculus.