book Maths Puzzle Numerical Ability

Find an equation of the ellipse having the given points as foci and the given number as sum of focal radii.
(-9,0);(9,0); 30

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my question is:
find the coordinates of the midpoint of the line segment with endpoints (-3,6) amd (-1,9).
when i did this problem i got (-2,-3/2) is that right?
thanks for the help! Interest on late property taxes is 16% per year compounded monthly. Find the total to be paid for the $1,700 tax and 10 months late. Round the answer to the nearest cent.
How do