Question

What are the domain and range of the relation that models this situation!! Plz help and explain it so Ican understand thank you!

Answer 1

Domain:
`0 \le t \le 9`

Range:
`7200 \ge \ d \ge \ 0`

Explanation:

Given

`d = 7200 - 800t`

Required

Determine the domain and range

From the attached graph, the values of t (on the horizontal axis) starts from 0 and ends at 9.

Hence, the domain is:
`0 \le t \le 9`

When t = 0:

`d = 7200 - 800t = 7200 - 800 * 0 = 7200`

When t = 9

`d = 7200 - 800t = 7200 - 800 * 9 = 0`

Hence, the range is:

`7200 \ge \ d \ge \ 0`