Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
The first choice doesn't give enough information about x and y (or x + y). Either one of them can be 0 and other positive or both could be positive... many possiblities. BUT the second choice leads you to see that x + y is less than -1. So for x + y + z > 0 to be true, 'z' has to be greater than 1.