How to solve a system of equations by graphing

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

Find the equation of the line with slope =8 and passing through (6,53) write your equation in the form y=mx+b

Need asap. solve for the following inequality