Answer:
Each salesperson sold 89 cars last year.
Step-by-step explanation:
13x = 1157 Set up an equation with an x-varible in place of the number of cars to be found
13x/13 = 1157/13 Divide 1157 by 13
x = 89
Answer:

Step-by-step explanation:
Do FOIL, first outside inside last
3x × 3x = 9x^2
3x × -7 = -21x
7 × 3x = 21x
7 × -7 = -49

So it would just be 9x^2 - 49