Question 1099057
Linear is y=4.55x+10.31 r^2 of 0.997
Cubic is y=0.103x^3-.34x^2+7.40x+6.62 and r^2 is 0.997
when x=5, y=48.0
x=10, y=112.62
x=15, y=388.745
cubics become very large as x increases modestly

linear had almost same fit
x=5
33.06
x=10
55.86
x=15
78.56
so while the R^2 is slightly better for the cubic function, the linear approximates everything much better.