What is 4 to the square root of 20

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

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

Closing a credit card usually _your debt ratio.a. increasesb. decreasesc. improvesd. has no effect on