Question

On a winter morning, the temperature before sunrise was -10℉. The temperature then rose by 1℉ each hour for 7 hours before dropping by 2℉ each hour for 3 hours. What was the temperature, in degrees Fahrenheit, after 10 hours?

Answer 1

The answer is in the picture

Explanation:

Answer 2

The temperature after 10 hours is -9 ºF.

Explanation:

This statement can be translated mathematically as follows. The temperature after 10 hours from sunrise is:

`T = -10\,^(\circ)F + \left(1\,(^(\circ)F)/(h) \right)\cdot (7\,h)+ \left(-2\,(^(\circ)F)/(h) \right)\cdot (3\,h)`

`T = -9\,^(\circ)F`

The temperature after 10 hours is -9 ºF.