Lisa finds a hat that is already marked down. the price tag shows that the original price was $36.00. the marked down price $27.00. what percent has the hat been marked down? explain

Taking algebra two apex courses and need with these questions

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 do you determine if an ordered pair is a solution to a given equation?