Answer:
D
Step-by-step explanation:
6x + c = k ( isolate the term in x by subtracting c from both sides )
6x = k - c ( isolate x by dividing both sides by 6 )
x = 
A is the ans , like they are actually the same equation
Adding all vakus in data set and divide by the number of values in the data set
I think it might be B.
If it’s wrong then I’m sorry