Please help with my math!

Me what is the value of x? showing work would be appreciated - ! : )

The step function g(x) is defined as shown.what is the range of g(x)? ***answer choices in picture.

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