Question 1:
For this one, we can use the midpoint formula.
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
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The second choice is your answer
Question 2:If you draw this on the coordinate plane, we have a right triangle with legs of 12 and 9. This is similar to a 3-4-5 right triangle.
Thus, the lengths 9, 12, and 15.
9 + 12 + 15 = 36
Your answer is the last choice. Have an awesome day! :)