What is f(9) if F(x)3x 10?

It seems there is a typographical error in your question. If you meant to ask for ( f(9) ) in the context of a function ( F(x) = 3x + 10 ), then we would need to clarify whether you are looking for ( F(9) ) instead. If so, substituting 9 into the function gives ( F(9) = 3(9) + 10 = 27 + 10 = 37 ). Please confirm if this is what you intended or provide more details.