An ant is 1.2 cm up a wall and climbs up 1.7 cm each second. A
second ant is 30 cm up the wall
and climbs down 1.5 cm each
second. After how many seconds
will the ants be the same height
up the wall ?

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,