Textbook Problem

The graph of a function f is shown below.
a. Is $f\left(0\right)$ positive or negative?
b. For what values of x does $f\left(x\right)=0$ ?
c. Find approximate values for $x_1$ and $x_2$so that $f\left(x\right)=f\left(x_2\right)=1$ but $x_1\ne x_2$ .
d. Find an approximate value for x such that $f\left(x\right)=1.5$.
e. As x increases from $-3$ to $-1$ , do the values of f increase or decrease?
f. As x increases from 0 to 4, do the values of f increase or decrease?