Respuesta :

Answer:

Perhaps -33

Step-by-step explanation:

I'm not sure I understand "4a a-5b, in a = 12 and b = 9​"

What does 4a a-5b mean?

If the question is to find the value of a - 5b when a=12 and b=9, then:

    a-5b

   12 - 5*9

   12 - 45

    -33