Answer
(a.) $\$17,000$.
(b.) $\$17,389$, Reasonably well.
(c.) $\$17,226 $, Reasonably well.
Work Step by Step
(a.) In the graph Consider the point $(2000,17)$on the line graph.
It indicates in $2000$ the cost is $17$ thousands of dollars.
$=\$17,000$.
(b.) Model #1 is as follows:
$\Rightarrow C=442x+12,969$
Plug $x=2000-1990=10$.
$\Rightarrow C=442(10)+12,969$
Simplify.
$\Rightarrow C=4420+12,969$
$\Rightarrow C=\$17,389$
Reasonably well.
(c.) Model #2 is as follows:
$\Rightarrow C=2x^2+390x+13,126$
Plug $x=2010-1990=20$.
$\Rightarrow C=2(10)^2+390(10)+13,126$
Simplify.
$\Rightarrow C=200+3900+13,126$
$\Rightarrow C=\$17,226$
Reasonably well.
