Solve the system of equations by substitution. y=3x-10,3x+2y=16

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

With alll of except for the 2 that i did already

If you measured the width of a window in inches and then in feet with measurement would you have the greater number of units