Question

Let d(t) be the total number of miles Joanna has cycled and let t represent the number of hours after stopping for a break during her ride d(t) = 12t + 20 so d(4) equals

Answer 1

Explanation:

Hi there!

d(4)=?

where

d= distance

t= hours

In this Linear function given by the law d(t) = 12t +20 and the graph below. To find the d(4), means to find out how many miles she cycled in the instant 4 hours.

By this function, after a break , the instant t=0, she had already cycled 20 miles.

Let's calculate

d(4) = 12(4) +20

d(4) =48+20

d(4)= 68 miles

Answer 2

68 miles

Explanation:

Given that d(t)=total number of miles Joanna has cycled

Given that t= number of hours fater stopping for a break during the ride

d(t)=12t +20

d(4)=?

replace value of t with 4.

d(4)=12*4 +20

d(4)=48+20=68 miles