Answer :

madison1284
The answer is B.
F(5)= 7(5)-4 which is 31.
So
F(6)= 7(6)-4 which is 38.
If you subtract the 2nd # by the first it gets you 7. So add 7 to 3=10
10+7=17
17+7=24
24+7=31
31+7=38.

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