Jenny purchased a prepaid phone card for $30 . long distance calls cost 6 cents a minute using this card. jenny used her card only once to make a long distance call. if the remaining credit on her card is $27.12 , how many minutes did her call last

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,