Is it a function or non function?

Which point is on the line y=-2+3? (-2,-1) (3,3) (3,-3) (-3,-9)

The table below shows the height of a ball  x  seconds after being kicked.  what values, rounded to the nearest whole number, complete the quadratic regression equation that models the data? f(x)  =  x2  +  x  +  0based on the regression equation and rounded to the nearest whole number, what is the estimated height after 0.25 seconds?   feet

How many lines can be drawn through points j and k? 0 1 2 3