Answer:

Step-by-step explanation:
Let:

This allows us to manipulate the equations like we normally would.

Then, we return the values where they belong.

Finally, we add:

Answer:
x>4
Step-by-step explanation:
Answer:
$39.90
Step-by-step explanation:
if each video game cost $3.30, and she rented 7, then you multiply $3.30 by 7, to get $21.10, and if each DVD was $4.20, and she rented 4, then its $4.20x4= $16.80
after that you just add the two total costs together, which is $23.10+$16.80=$39.90
Is the second one because the books and the costs never will equal.