What is (5,-2) with an undefined slope equation?

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

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

What is the equation of a line passing through (-6,5) and having a slope of 1/3