Answer
C$(x)=2.25x+10$
Work Step by Step
In a cost function of the form $C(x)=mx+b$,
$m$ represents the marginal cost and $b$ represents the fixed cost.
Here,
b= $\$ 10$ (fixed cost) and
m= $\$ 2.25$ (the cost per hour).
Let $x=$ number of hours, and
C$(x)=$ cost of renting a snowboard for $x$ hours.
C$(x)=$ ( cost per hour)(number of hours)+fixed cost
C$(x)=2.25x+10$
