Question

On a winter morning, the temperature before sunrise was -11 Fahrenheit. The temperature than rose by 1/2 degree

each hour for 7 hours before dropping by 2 1/4 degrees each hour for 3 hours. What was the temperature, in degrees Fahrenheit, after 10 hours?

Answer 1

the answer is -11.25°F
detailed answer is in the attached image.

Answer 2

-14.25 degrees Fahrenheit was the temperature after 10 hours.

Explanation:

The temperature before sunrise = -11°F

Temperature after rise by 1/2 degree each hour for 7 hours that id before dropping.

`T=(-11 + (1)/(2)* 7)^oF=-7.5^oF`

Now after 7 hours drop in temperature takes place
`2(1)/(4)` degrees each hour for 3 hours, sat T'

`T'=(-7.5-2(1)/(4)* 3)^oF`

`T'=(-7.5-(9)/(4)* 3)^oF=-14.25^oF`

-14.25 degrees Fahrenheit was the temperature after 10 hours.