Estimate to the nearest hour, the most common number of hours of sleep required by a mammal.

7-8

Step-by-step explanation:

As humans are mammals, we require around 8-12 hours of sleep, this means that most other mammals may require the same amount of sleep. According to the provided chart, 9 is the average, and between 6-7 hours are the most common.

66.666666667%

step-by-step explanation:

divide 150 by 100

divide 100 by 1.5

there you go!

decreased by 33.333333334%

y=-2.5x+12.5

step-by-step explanation:

5y=2x+10

y=0.4x+2

slope=-2.5

5=-2.5*3+b

b=12.5