Answer
$\text{a) }
h(3)\approx-10
\\\text{b) }
x\approx5$
Work Step by Step
$\bf{\text{Solution Outline:}}$
Use the information in the given graph.
$\bf{\text{Solution Details:}}$
To estimate $
h(3)
,$ find the value of $y$ when $x=
3
.$ Based on the graph, then $
h(3)\approx-10
.$
To estimate $
h(x)=-15
,$ find the value of $x$ when $y=
-15
.$ Based on the graph, $
x\approx5
.$
The answers are
\begin{array}{l}\require{cancel}
\text{a) }
h(3)\approx-10
\\\text{b) }
x\approx5
.\end{array}