the temperature in Alaska dropped by -5.7 degrees every hour for 3.5 hours.if the temperature started at 23 degrees f,what temperature was it at the end of the 3.5 hours?

Answer 1

how do you drop by -5.7°

Maybe you mean either
it dropped by 5.7°
or, it changed by -5.7°

In that case, after 3.5 hours, the change is clearly -5.7 * 3.5°

So, add that to the starting 23°, and what do you get?