book Maths Puzzle Numerical Ability

Subtract. Reduce answer to simplest form.

(2)/(5w + 10) minus (3)/(2w - 4)

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book Other Question

Radioactive element R DECAYS EXPONENTIALLY AT A RATE OF #5 PER YEAR. iF WE BEGIN WITH 5 GRAMS OF R., HOW LONG ( TO THE NEAREST TENTH OF A YEAR) WILL IT TAKE FOR ONLY 3 GRA Trying to find the answer to:

-6-(-7--15-(-12))

Cannot remember how to manipulate (-12) to work the problem.