What is the y-intercept of the graph?

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

Give all possible names for the line shown.calculation tip: lines can be written with either point first.

I’m really confused and need to learn this