book Maths Puzzle Numerical Ability

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!

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book Other Question

Roz is twice as old as Grace. In 5 years the sum of their ages will be 28. How old are they now? 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