Question

On a cold January morning, the radiator fluid in Christine’s truck is –13°F. With the engine on, the temperature goes up by 3.6°F per minute. How long will it take the radiator temperature to reach 50°F?

Which expression tells how much the temperature needs to change from -13°F to 50°F?
Which expression tells how long it will take for the temperature to change?
How much time will it take for the temperature to change?

Answer 1

Which expression tells how much the temperature needs to change from -13°F to 50°F?

50 - ( -13 )

Which expression tells how long it will take for the temperature to change?

50 - ( -13 ) ÷ 3.6

How much time will it take for the temperature to change?

17.5 minutes

Answer 2

It will take 17.5 minutes to reach 50 degrees F.

Explanation:

Current temperature = -13 degrees F

With the engine on, the temperature goes up by 3.6°F per minute.

Let us assume that it takes x minutes to reach 50 degrees F.

So, the time taken will be =

`-13+3.6(x)=50`

=>
`3.6x=50+13`

=>
`3.6x=63`

x = 17.5 minutes

The expression that tells how much the temperature needs to change from -13°F to 50°F is :
`-13+3.6(x)=50`

It will take 17.5 minutes to reach 50 degrees F.