=(new-old)/old *100%
=(90-75)/75 *100%
=20%
<span> hope it helps</span>
if 35 is LESS than 39
so +35 - 39 is -4 F°
the answer to the freezing point of (hehe) butter is -4 F°
We know:


substitute a = -3; b = 7; c = -15
Answer: D
Used my graphic calculator