Question

The Li family is going hiking. The distance from their car can be found using the function d(t) = 3t + 1, where d is the miles away from their car and t is in hours that they have hiked. If d(t) = 7, what is the value of t and what does it represent?

A. t = 2, the Li family has been hiking for 2 hours

B. t = 22, the Li family has been hiking for 22 hours.

C. t = 2, the Li family is 2 miles away from their car.

D. t = 22, the Li family is 22 miles away from their car.

Answer 1

A

Explanation:

d(t)=3t+1 but d(t)=7

distance*time=3*time+1

so d(t)=7 is the same as

d(t)=3(2)+1

meaning that you hiked for 2 hours.