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Problems to workout
 1  Solve the IVP y' = x + y + xy,  y(0) = 1 by Euler's method for y at x = .1 and at x = .5
 2 Solve for y at x = 1.0 with steplength 0.1,    y' = -0.9y/(1+2x),  y(0) = 1.
 3 Solve y' = y sin x + cos x, y(0) = 0 at x = 0.5
 4 Solve the IVP xy' = x - y, y(2) = 2  at x = 2.3