Chapter 9, Problem 15CR

To determine

To find the cost of renting the paddle boat for $\text{7hours}$ .

Answer to Problem 15CR

The cost of renting the boat for $\text{7}$ hours is $\$63$ .

Explanation of Solution

Given information:

The given statement is:

“The cost of renting a paddle boat varies directly with the number of hours, as shown in the table.”

Calculation :

The difference between each hours is $1$ and the difference between each cost is $9$ .

The cost per hours can be written as:

  $\begin{array}{l}\text{Cost per hour}=\frac{\text{Difference in cost}}{\text{Difference in hours}}\\ \text{Cost per hour}=\frac{\text{9}}{\text{1}}\\ \text{Cost per hour}=\$9\text{ per hour}\\ \text{Cost for 7 hours}=\$\left(9\times 7\right)\\ \text{Cost for 7 hours}=\$63\end{array}$

Hence, the cost of renting the boat for $\text{7}$ hours is $\$63$ .