Substitute the values of a and b into the expression:
11 + 3 - 2
Add first because of order of operations (perform addition and subtraction in the order of occurrence from left to right):
14 - 2
Subtract (same justification as above just with subtraction instead):
12
Hope this helps!
The difference starts off by 7. Then it continues to double. Then the answer is 14, 28, 42. The answer doubles every time.
If the marker is 0.13cm, then it is 13 millimeters.
