A city know for its temperature extremes started the day at

A city know for its temperature extremes started the day at -5 degrees Fahrenheit. The temperature increased by 78 degrees Fahrenheit by midday, and then dropped 32 degrees by nightfall.

a. What expression can you write to find the temperature at nightfall?

b. What expression can you write to describe the overall change in temperature? Hint: Do not include the temperature at the beginning of the day since you only want to know about how much the temperature changed.

c. What is the final temperature at nightfall? What is the overall change in temperature?

Thank you!

Solution

a) The expression for the temperature at nightfall is -5 + 78 - 32

b) The expression for the overall change in temperature is 78 - 32

c) The final temperature at nightfall is -5 + 78 - 32 = 41^o F

and the overall change in temperature is 78 - 32 = 46^o F