Write an EQUATION that could be used to apply the ratio 3 to 12 as a scale factor.? Must show work

Use the elimination method to find the solution to the system of equations. 2x - 3y = -9 -x + 3y = 6

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

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.