Find the natural domain in each case. (a) f(x) = 4 - x2 (b) G(y) = (y
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(a) f(x) = 4 - x2
(b) G(y) = √(y + 1)-1
(c) ϕ(u) = |2u + 3|
(d) F(t) = t2/3 - 4
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