Help i dont understand thus at all!

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

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?

Find the area of the region between a regular hexagon with sides of 6" and its inscribed circle.