In a science experiment, the temperature of a substance is changed from 42 °f to −54 °f at an average rate of −12 degrees per hour. over how many hours does the change take place? a 8 hours b 1 8 hour c −8 hours d 1 hour

Remark

There are a couple of ways to do this. The easiest is to take the number of degrees between 42 and - 54 and divide by 12.

Method

the number of degrees is abs(42) + abs(-54) = 42 + 54 = 96

Now divide by 12

Hours = 96 / 12 = 8 hours. I think the answer is A.

+25 = x

step-by-step explanation:

here x is the hypotenuse of a right triangle whose legs are 7 and 24.   by the pythagorean theorem, 7² + 24² must equal x²:

x² = 49 + 576 = 625.   thus, x = +√625 = +25 = x

step-by-step explanation:

de-gf

hj=3x+20

ji=15x-64