exam Maths Puzzle Numerical Ability

Subtract and put in simplest form:

2 3
----- - -------
5w+10 2w-4

This problem has completely lost me, needing some help on this one, thank you for the help you offer.

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exam Other Question

10.32 A 2005 study found that 202 women held board seats out of a total of 1,195 seats in the Fortune 100 companies. A 2003 study found that 779 women held board seats out of a tot for f(x)= 2x^5+3x^4-6x^2+1, what does descartes rule of signs tell you about

a) the number of positive real zeros?
b) the number of negitive real zeros?