Answer:
4
Step-by-step explanation:
Divide 28 by 4 to get 7
A constant can either shift the graph up or down. If coefficient is less than 1 it will make the graph wider, if it's more than 1 it will make graph more narrow
It would be 8 because 8+4=12
62=2×31
82=2×41
so the answer is 2
