Ingrid had 30 dollars to spend on 3 gifts. She spent 10 3/4 dollars on gift A and 5 1/2 dollars on gift B. How much money did she have left for gift C?

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,

what is the rest of the question? ?