Respuesta :

Answer:

a) 39 b) 17

Step-by-step explanation:

12x - 9

12(4) - 9

48 - 9

39

d/15 + 13

(60)/15 + 13

4 + 13

17

Answer:

A=39      B=17

Step-by-step explanation:

12 times 4= 48 then 48-9=39