A parent is going school shopping for her children. She has $56.50 to spend on school supplies and wants to purchase at least 16 items. Composition notebooks cost $3.99 each and pencils cost $1.99 a box. Write a system of inequalities to show how many composition notebooks, x, and pencil boxes, y, the parent can afford to buy.

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,