Can someone help me answer these 3 questions? I’ll reward points + brainalist

The table represents a linear function. what is the slope of the function? –6 –4 4 6

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

With number 11 ( show how you got the answer)