If f(x) = 2x + 3, what is f(4)?

To determine the value of ( f(4) ) when given the function ( f(x) = 2x + 3 ), you substitute ( x ) with ( 4 ).

Start by substituting ( 4 ) into the function:

[ f(4) = 2(4) + 3 ]

Calculate ( 2(4) ):

[ 2(4) = 8 ]

Now, add ( 3 ):

[ 8 + 3 = 11 ]

Thus, ( f(4) ) evaluates to ( 11 ). This shows that the correct answer is indeed ( 11 ). The process of substitution into the function and performing the arithmetic step-by-step confirms the result.