Can someone check if i did this question right it’s slope

Given this information, which expression must represent the value of b?

Consider the functions below. function 1 function 2 function 3 select the statement which is true about the functions over the interval [1, 2] a b function 3 has the highest average rate of change function 2 and function 3 have the same average rate of change. function and function 3 have the same average rate of change function 2 has the lowest average rate of change d.

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?