Pam plans on surveying students to determine whether more sixth-graders or the eighth-graders participate in after school activities. Which data collection method would give her the MOST representative information? survey 40 randomly selected students at the eighth-grade dance survey the first 40 students who enter the school building on Monday survey 40 randomly selected students studying in the library during the lunch hour survey 20 sixth-grade students and 20 eighth-grade students randomly selected from the school

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 : )