Point P is certainly the outlier because the other points are all consistent with the string of data while Point P is alone with no other data around it.
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3 over 4 is already simplified. 15 over 12 is 5 over 4. If you are having trouble with the concept, www.ducksters.com/kidsmath/fractions_reducing_simplifying.php is a great guide
Final Answer: 
Steps/Reasons/Explanation:
It is common addition and subtraction because they all have w after the number. This means they are the same variable. A plus minus (+-) would be a minus (-).
Question: Simplify the expression:
.
<u>Step 1</u>: Simplify.

<u>Step 2</u>: Simplify.

~I hope I helped you :)~