B. A teacher weighed 145 pounds in 1986 and weighs 187 pounds in 2007. What was the rate of change in
weight?

2 pounds per year.

Step-by-step explanation:

2007-1986 = 21 yrs

187-145 = 42 pounds

42 pounds /21 yrs = 2 pounds /yr

the teacher gained 42 pounds in 21 years . Each year the teacher gained 2 pounds.

Step-by-step explanation:

187-145=42

2007-1986=21

42 divided by 21 = 2

168

step-by-step explanation:

first off, we know that he drove 3.5 hours at a rate of 48 mph.

knowing that, we want to see how many miles he drove all-together.

in this case, we can just multiply 48 by 3.5.

48 * 3.5 = 168