Answer
a) 4
b) 2/3
Work Step by Step
a) From the graph: f(-1)=0, f(5)=4
f(5)-f(-1)=4-0=4
b) $\frac{4-0}{5--1}=2/3$
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.