So this is pretty simple. So we know that Mary tries to raise 150 dollars. We also know that she already has $25. Also Mary gets paid 25 dollars every time she babysits. So we know that we have to multiply for $25 times d. So it's our job to find out how many times she babysits. Then you have to add up what she already has which is $25. So put that together 25xd then add that answer by 25 and BOOM there you go..
If your having trouble the answer is d=5. So multiply 25 x 5 then add.