Fitting of straight line, Parabola, Power curve and Exponential curve by least squares using R.

1. Fit a straight line for the following data and also plot the observed values in a graph x=0,1,2,3,4,5 and y=5,7,9,11,13,15

2. Fit a second-degree parabola for the following data and also plot the observed values in a graph x=1,1.5,2,2.5,3,3.5,4,4.5 and y=2,18.5,29,42,57.5,75.5,96,119

3. Fit a power curve of the type y=a(x)^b for the following data x=1,2,3,4,5 and y=3,12,27,48,75

4. Fit an exponential curev of the type y=a(e)^bx to the following data x=1,2,3,4,5,6,7,8,9 and y=20,30,52,77,135,211,326,550,1052