You add all of them together if it’s labeled with a X.
For example, the first X is 1 hour. If it has 2 Xs it would be 2 hours, if no X is shown above, it’s zero hours.
Answer is 12 hours.
Multiply every coordinate by the scale factor 3
(-1,2,0) ----> (-3,6,0) is the answer
Since the products of the two numbers must be 34, and Y=7, we have