The mass of a part of a metal rod that lies between its left and a point x meters to the right is 3x^2 kg. Find the linear density when x is:
(a) 1 m
(b) 2 m
(c) 3 m
Also, where is the density the highest? The lowest?
If anyone could help me out with this one that would be great! maybe show me how to do a,b or c and then I can try the rest? thanks!