Mrs. Redline teaches Exploratory Topics and wanted to help her students excel on the upcoming midterm exam. She decided to test the hypothesis that completing the review packet will cause higher grades on the midterm exam. She decided to conduct an experiment. Her 3rd period class worked on the review packet during class, getting help when needed. Her 4th period class was not given a review packet. Her 2nd period class was asked to complete the review packet for homework, as previously assigned. Afterward, Mrs. Redline compared the midterm exam grades for each class. What was the variable of interest? A) Variable X
B) Variable Y
C) There was no Variable of Interest
D) The grades on the midterm exam were the variable of interest

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 : )