Question

Plz :<

In a science experiment, the temperature of a substance is changed from 42 degrees Fahrenheit to -54 degrees Fahrenheit at an average rate of -12 degrees per hour. Over how many hours does this change take place? *
10 points

A -8 hours
B. 1/8 hour
C. 1 hour
D. 8 hours

Answer 1

D 8 hours

Explanation:

it has to be positive and it is obviously more than 1 hour so it has to be 8 hours by process of elimination.