Question

The graph of f(x) is shown. Estimate f(–3).

Answer 1

You have to look for -3 on the x axis, and then proceed vertically (in this case upwards) until you meet the graph.

We land about 1/2 square above the 12 mark on the y axis. Since one square is 1/2 unit, a half square would be 1/4 unit.

So, we can estimate $f(-3)\approx 12.25$