Answer:
C
Step-by-step explanation:
since f(x)= 2x+1 , then F(a+2) = 2 (a+2) + 1
everywhere you see x , you replace x with (a+2)
F(a+2) = 2(a+2) + 1
F(a+2) = 2a+ 4+ 1
F(a+2) = 2a+5
therefore the answer is C
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