Determine x in the case below, knowing that angle A is a right angle, B is angle 2x+5, C is angle x+1, D is angle 3x-10, E is angle 3x.

Knowing the functions f(x) = 2x − 1 and g(x) = x2 + 7, determine the following composite functions:

a)f ∘ g

b) g ∘ g

c) g ∘ f

d) f ∘ f