The problem in the picture would be
x^2+10x+21
Answer:
Option A. 
Step-by-step explanation:
we know that
The area of the rectangle is equal to
A=LW
where
L is the length of rectangle
W is the width of rectangle
we have

Plot the vertices
see the attached figure
L=AD=BC
W=AB=DC
the formula to calculate the distance between two points is equal to
<em>Find the distance AD</em>

substitute in the formula
<em>Find the distance AB</em>

substitute in the formula
Find the area

The answer is a I believe
I hope this helped :)
Miles per hour = Total miles/ total no of hours
1764 miles divided by 28 hours = 63 mph