  ### Home > CC3 > Chapter 8 > Lesson 8.1.2 > Problem8-21

8-21.

The choir is planning a trip to the water park, and the parents are trying to determine how much to charge each child. The cost to use a school bus is $\350$. Complete the table at right, graph your results, and then answer parts (a) and (b) below.

1. Think back to your work with proportions. Is this a proportional relationship?

To complete the table, divide $350$ by the number of students.

Graphs of proportional relationships can pass through the point $\left(0, 0\right)$. Does your graph look like it will pass through $\left(0, 0\right)$?

1. Is there an association between the number of students and the cost per student? If so, describe it. Consider the form, direction, and outliers in your description.

• For every student added, the trip costs less for everyone.

There is a non-linear negative association.

Number of
Students on
the Trip

Bus Cost per
Student (\$)

$10$

$15$

$20$

$35$

Use the eTool below to help complete the table and graph the problem.
Click the link at right for the full version of the eTool: 8-21 HW eTool