Please show work.

1. Explain how to find the following for the function f(x) = -73 -1812 -105r -6. And find them using calculus techniques. (a) The open intervals where f(r) is increasing or decreasing. (b) The relative extrema of f(a). 2. For each of the following functions, describe the open intervals where it is concave up or concave down, and any inflection points. (a) f(x) = -425 - 21- ( b ) f ( x ) = $25+2