It takes Julie 15 minutes to put all of her son’s toys in the toy box. While she tries to put away his toys, her son is constantly pulling toys out of the toy box and putting them back on the floor. It takes him 20 minutes to empty the toy box by himself. How long will it take Julie to put away all the toys if her son keeps trying to pull them out?

First, think of what you know. you know that the number t the end of the equation will need to be subtracted because it is the money he lost from buying the lawn mower. and your first two weeks have negative profit, so that tells you that c and d are wrong. now you can plug any of the weeks into a and b to see which one works. i'll start with plugging week 1 into a.this isn't right because it says your answer for week one should be -90.so now we need to try the same thing with b.this one got you the right answer, (sometimes if you only check with one of the weeks multiple will work so you need to check with more of the weeks, but it worked out fine here)this means that b is the correct answer.let me know if you need more clarification. i hope this : )