Respuesta :

Ploximital

Answer:

3

Step-by-step explanation:

7*3=21

21*3=63

Hope this helps.

lovelyyyyisabelle

Answer:

decreasing by a multiple of 3

Step-by-step explanation:

7x3=21, 21x3=63.

I think this is the answer! or I hope this helps a bit. have a good day or night!