The same poll of 1,021 US adults showed that 75% believe that development of nuclear weapons by Iran is also a critical threat to US vital interests in the next 10 years. The margin of error for this estimate is also ±4 percentage points. A member of the US House Committee on Appropriations is satisfied with 95% confidence, but she wants a smaller margin of error than ±4 percentage points to be able to distinguish which threat is more concerning to Americans. Which of the following modifications will achieve the smaller margin of error at 95% confidence? a. change the sampling method
b. decrease in sample size
c. increase in sample size

These graph is cross the yaxis and x axis two ways.

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 : )