Let f(x) = 3x - 7 and g(x)=1-x². Evaluate each expression symbolically.
(a) (f+g)(4)
(b) (f-g)(-3)
(c) (fg)(0)
d) (4)
(a) Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
OA. (f+g)(4) =
OB. The answer is undefined.
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(Simplify your answer.)