. (a) Sketch the graph of a function that has two local max- ima, one local minimum, and no absolute minimum. (b) Sketch the graph of a function that has three local minima, two local maxima, and seven critical numbers. 15-28 Sketch the graph of f by hand and use your sketch to find the absolute and local maximum and minimum values of f. (Use the graphs and transformations of Sections 1.2 and 1.3.) 15. f(x) = 32x, x-1 16. f(x)=x², -11 18. f(x)=1/x, 1