Answer:
and 
Step-by-step explanation:
Given

Required
Determine the values of x

Take square root of both sides


Expand 45 as 9 * 5

Split the square root



This can be further split to:
or 
Hence, the possible values of x are
and 
So the distance that he is off by is 1 mile. The question is what percent of 14.5, 1 is.

Take the top of the last fraction, and that's the proper percentage; 6.9%
6.9%
3.4444444 because u only need to divide 137 by 45
Average speed
Average speed between the checkpoints
distance between the checkpoints
divided by
time between the checkpoints.
Distance between the checkpoints =
(mileage at B) minus (mileage at A)
=(208)-(120) = 88 miles .
Time between the checkpoints =
time at - time at A
=(3:00 PM) - (1:00 PM) = 2 hours .
Average speed between the checkpoints =
(88 miles) / (2 hours)
=44 miles per hour .