the temperature in the desert can drop as much as 40'f from noon to midnight .At noon on july 31st the temperature in sahara desert is 3'f .If th temperature drps 39'f by midnight , what is the temperature at midnight ?

Is this a typo?

At noon on july 31st the temperature in sahara desert is 3'f

no

3 - 39 degrees = -36 degrees F.

To find the temperature at midnight, we can start with the temperature at noon and then subtract the drop in temperature.

Given:
Temperature at noon = 3°F
Drop in temperature = 39°F

To find the temperature at midnight, we'll subtract the drop in temperature from the temperature at noon:

Temperature at midnight = Temperature at noon - Drop in temperature

Temperature at midnight = 3°F - 39°F

To perform the subtraction, we start at 3°F and subtract 39°F:

Temperature at midnight = -36°F

Therefore, the temperature at midnight in the Sahara Desert on July 31st is -36°F.