This is known as a variant!
Part A:
y=mx+b
621=83(7)+b
Part B:
621=83(7)+b
621=581+b
621-581=b
b=40
Insurance cost is 40$
So firstly, square root 9a^2 and 49: 
Next, combine like terms, and your answer will be
, or the third option.
The factors of 697 or 6,9,7?