Answer:
5
Explanation:
w = c + ___
means that you add a number to the value of c to get the value of w.
Look at the first line: c = 5; w = 10
What do you add to 5 to get 10?
Answer: 5
5 also works for all the other lines.
6 + 5 = 11
7 + 5 = 12
8 + 5 = 13
The number added to c to get w is always 5.
w = c + 5
Answer: 5