Answer:
c ≤ -196
Step-by-step explanation:
The given expression, a number c divided by 7 is at most -28 can be written as:

It is the same to say that a c divided by 7 is less than or equal to -28.
So, we can solve for c by multiplying both sides of the inequality by 7 as:

Therefore, c can be at most -196.