PLEASE HELP I DONT KNOW HOW TO DO IT!!!!!!
A: He had $77 in his account before mowing lawns. In order to solve for A you have to first divide 234 by 2. You will get 117. Then you have to subrtract 40 from 117 to get 77.
Let's rephrase the problem: Trey saved x money. He earned $40 mowing lawns, bringing his total money to (x + 40). His parents double that amount, so he has (x + 40) + (x + 40), or 2(x + 40). That amount is equal to $234. So you can make the equation; [latex]2(x+40)=234\\ Solve\\ x+40=117\\ x=77[/latex] So he saved $77 before he mowed the lawns. I'm not sure exactly what they meant by comparing the two, but I hope this really helps :D