answer: 72.5
reason:
substitute the x for 24
this makes the equation f(x)=3(24)+2/4
multiply 3x24 and get 72
add 2/4 (or 1/2) to 72 and get 72.5
note that depending on how your teacher wants it written, it could also be 72 2/4 or 72 1/2, decimals are just easier in this case
