Answer
$\text{a) }
f(250)\approx5
\\\text{b) }
x\approx75$
Work Step by Step
$\bf{\text{Solution Outline:}}$
Use the information in the given graph.
$\bf{\text{Solution Details:}}$
To estimate $
f(250)
,$ find the value of $y$ when $x=
250
.$ Based on the graph, then $
f(250)\approx5
.$
To estimate $
f(x)=4
,$ find the value of $x$ when $y=
4
.$ Based on the graph, $
x\approx75
.$
The answers are
\begin{array}{l}\require{cancel}
\text{a) }
f(250)\approx5
\\\text{b) }
x\approx75
.\end{array}
