Answer
a) -2
b) -1/2
Work Step by Step
a) From the graph: f(1)=4, f(5)=2
f(5)-f(1)=2-4=-2
b) $\frac{2-4}{5-1}=-2/4=1/2$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.