1. Sketch the graph of a function fwith the stated properties. (a) The function f is decreasing on the interval (oo, +oo), has an inflection point at the origin, and is concave up on (0, +oo) (b) The function fis increasing on the interval (-o0, +oo), has a point of inflection at the origin, and is concave down on (0, +00).