The area of a square piece of tissue paper is 25 square centimeters. how long is each side?

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 is the value of x in the this question ?

What is the result of adding the system of equations? 2x+y=4 3x-y=6