Hallar el área limitada por las curvas y rectas que se indican
a) y= X3, y=0, X=1, X=3
b) y=4X – X2, y=0, X=0, X=3
c) y= X2, y = 0, X = 2, X = 5

Modern high speed trains do not have perpendicular expansion gaps where rails are joined end-to-end any more they are mostly welded together but what might happen if there was a spell of particularly hot weather that causes inspection of the tracks?