Write and solve an equation to determine how many degrees the temperature tt fell. the temperature at 5 p. m. is 20∘20∘
f. the temperature at 10 p. m. is −5∘−5∘f

In order to determine the temperature drop per hour, we use the formula:

Rate of drop = (final temperature - initial temperature) / (final time - initial time)

Rate of temp drop = (-5 - 20) / (10 - 5)
Rate of temp drop = -25 / 5

The temperature dropped at a rate of -5 °F per hour.