What is the ninth term in the sequence? bn = 18 - 2n

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

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.

Aramp rises 4 feet over a distance of 10 feet. what is the length of the ramp?