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) = [32,96,88,68]. This means that after [cycling 4 miles, 4 hours, a 4 hour break, cycling at a speed at 4 mph], Joanna [took a 96 minute break, cycled for 68 miles total, rode for 32 hours total, cycled 88 miles total]

Answer 1

For this case we have the following equation:
 $d (t) = 12t + 20$
 The variables are:
 t: time in hours
 d (t): distance traveled in miles.
 We evaluate the distance traveled after 4 hours.
 So we have that for t = 4:
 $d (4) = 12 (4) +20 d (4) = 48 + 20 d (4) = 68$
 Answer:
 d (4) = 68
 This means that after 4 hours Joanna cycled for 68 miles total

Answer 2

Answer:

68

a 4 hour break

cycled 68 miles total