The center of a circle is at the origin on a coordinate grid. The vertex of a parabola that opens upward is at (0, 9) . If the circle intersects the parabola at the parabola's vertex, which stalement must be true?

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,

step-by-step explanation:

infinity is the answer