Is 30: 12 and 40: 16 the same ratio

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line

(hurry! ) which expression is equivalent to the following complex fraction?

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