Pls tell the answer for 20 points!

For what value of (y) is 3^3/3^y =1/9

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 is the slope of the line (-7,2) (4,6)