#R Programming

Write a function called Three$\_$curves$\_$graph$()$ that takes as an argument a vector of values $,$

$bs2,bs1,bs0,bc3,bc2,bc1,bc0,$xmin,xmax. The function must save in the working directory a graph

with $3$ curves:

$y=bc0+bc1*x+bc2*x^2+bc3*x^3$

$y=bs0+bs1*x+bs2*x^2$

$y=bl0+bl1*x$

Every line has to be depicted in the period from Xmin to Xmax; all three lines should be completely

visible on the plot, and the plot should contain a legend marking lines as "linear", "squared", and

"cubic".