It is a factor of the following equation because it equals zero
Average speed = distance / time
60 = distance / (13.20 - 10.40)
13.20 - 10.40 = 2 hours 40 minutes = 2 2/3 hours
60 = distance / 8/3 = 3 d / 8 (where d = distance)
3d = 480
d = 480/3 = 160 miles Answer
C., the two congruent sides make
Answer:

Step-by-step explanation:
In this problem we have a regular octagonal barrier (That means that all the length side are equal)
Find out the perimeter of the barrier
The perimeter is equal to

where
b is the length side of the barrier
we have

substitute in the formula of perimeter

Convert to mixed number
