10. Let f(x) = be a function on real numbers. (a) Find the domain D(f). (b) Find the domain D(fo f).

For the following exercises, determine whether the relation represents y as a function of x. y=1x

For the following exercises, determine whether each of the following relation is a function. y=2x+8

To graph the function f, we plot the points (x,) in a coordinate plane. To graph f(x)=x22, we plot the points (x,). So the point (3,) is on the graph of f. The height of the graph of f above the x-axis when x=3 is _______. Complete the table, and sketch a graph of f. x f(x) (x,y) 2 1 0 1 2

How do the graphs of the functions f(x)=x2 and f(x)=x21 differ? We graphed them at the start of this section. What is the difference between their graphs? How are their graphs the same?

For the following exercises, evaluate the function f at the values f(2),f(1),f(0),f(1),andf(2) . 68. f(x)=42x