Respuesta :
The answer is a
Step-by-step explanation:
Its a because 13 times 3 is 39
13 times 4 is 52
and 13 times 5 is 65
Answer:
13
Step-by-step explanation:
39 divided by 3 = 13
52 divided by 4 = 13
65 divided by 5 = 13
so therefore, the constant of proportionality is 13