book Maths Puzzle Numerical Ability

Angle ABC and angle DEB are vertical angles. Angle ABC = (4x + 50) degrees, and angle DEB = (2x + 60) degrees. Find x.

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book Other Question

Let f(x) = 2x + 1 and g(x) = x^2 - 4 and find the following:

(fg)(x)

(g of f)(x)
-5to the 4th power