Science Homework Help

This will be graph of cubic spline i need variable and answer i use mathcad

A car initially moving at 60 miles per hour, puts on its brakes at t=0. Its position at each second for the next 5 seconds is given in the table at the right. Use a Cubic spline to find the position at t=4.5 s ( I USE MATHCAD PLEASE ) [img>

t(s) (0,1,2,3,4,5)