(adapted from ross, 2.12) an school is offering 3 language classes: one in spanish, one infrench, and one in tagalog. the classes are open to any of the 100 students in the school. there are 28 students in the spanish class, 26 students in the french class, and 16 in thetagalog class. there are 12 students who are in both spanish and french, 4 who are in bothspanish and tagalog, and 6 who are in both french and tagalog. in addition there are 2students taking all 3 classes.

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 : )