What is the nth term formula for 10, 7, 4, 1, -2?

Which term best describes the association between variables a and b

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent and the median? 40 25 8 36 18 15 24 27 43 9 12 19 22 34 31 20 26 19 17 28

What’s the answer ? use the picture to see the problem