The circumference of a circle is 
Circumference = 
It says to leave in terms of pi which means that we won't solve 
Thus the answer is
.
Hope that helped!
Distance = rate times time. Thus,
d = (68 mph) (5.25 hrs) = 357 miles (answer)
The answer is x < 9 because
x-4<5
+ 4 +4
x<9