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Find the value of the variable and the length of each secant segment

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

The table shows the balance of a money market account over time. write a function that represents the balance y (in dollars) after t years.