Isaac newton's Third law of motion: every action has an equal and opposite reaction
Second Law: Force=mass(acceleration)
Or you might consider Galileo as the first.
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Subtract the first year from the second. That's the age in years - unless the person died before his birthday, in which case you have to subtract one from the previous result.
first, subtract the numerators of the given and just copy the denomnator.
The inverse operation for subtract 5 is add 5. This is because whatever number you start with, if you first "subtract 5" and then "add 5" or if you first "add 5" and then "subtract 5" you are back to the number you started with.
first find a common denominator then subtract the top numbers
179 You multiply first then subtract