Question

The distance d that a car can travel in a certain amount of time t can be found by multiplying the rate of speed r by the travel time. If a car has already travel 4 miles, the formula for the total distance travel is d= rt + 4. Which of the following gives the value of r, in terms of d and t?

Answer 1

`r=(d-4)/(t)`

Step-by-step explanation:

The formula for the total distance travel is

`d=rt+4`

We need to find the value of r, in terms of d and t.

Subtract 4 from both sides.

`d-4=rt+4-4`

`d-4=rt`

Divide both sides by t to find the value of r.

`(d-4)/(t)=(rt)/(t)`

`(d-4)/(t)=r`

Interchange both sides.

`r=(d-4)/(t)`

Therefore, the value of r, in terms of d and t is
`r=(d-4)/(t)`.

Answer 2

Answer:
`r=(d-4)/(t)`

If the formula of the the total distance travel is:

`d=rt+4` (1)

And we want to know the value of
`r` in terms of
`d` and
`t`, we have to clear
`r` from equation (1):

`d-4=rt`

`r=(d-4)/(t)`>>>>This is the value of
`r`