Respuesta :

sissymahaffey
2f+4f+2-3 if f=3

Plug in 3 for f

2*3+4*3+2-3

6+12+2-3 now work your way across
6+12= 18 18+2=20 20-3 =17

Answer=17
it is 17 because you just plug in 3 where f is in the equation so it would be: (2*3) + (4*3) +2 -3