Read this section to understand the definition of a derivative. Work through practice problems 1-8.

Practice 1: The graph of is a line through the origin. The slope of the line is .

For all

Practice 2: so

At the point , the slope of the tangent line is so the equation of the tangent line is or .

Practice 3:

Practice 4:

Practice 5: See Fig. 16 for the graphs of and

Practice 6:

Practice 7: ,

Practice 8: