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