Convert (4, 3pi/2) to rectangular form

Write an equation for the function that includes the points (1,4/5) and (2,2/3)

These tables represent a quadratic function with a vertex at (0, -1). what is the average rate of change for the interval from x = 9 to x = 10?

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2