“i need to know is this right or wrong . my worst subject is math ?

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

What can you determine about the solutions of this system

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?