What equation is the gizmo using yo find the x-coordinate

For each proportion find the unknown number x 1/5/8=×/15

Find the zeros of each function. f(x) = x^2 + 5x - 6

The table below shows the function f. determine the value of f(3) that will lead to an average rate of change of 19 over the interval [3, 5]. a. 32 b. -32 c. 25 d. -25