Respuesta :

1/4(6) + 3(7)
1.5+21
22.5
1/4c + 3d.....when c = 6 and d = 7

1/4(6) + 3(7) =
3/2 + 21 =
3/2 + 42/2 =
45/2 = 
22 1/2 or 22.5 <===