exam Maths Puzzle Numerical Ability

How many even positive integers are less than 42?

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exam Other Question

Can someone help me subtract this rational expression??? PLEASE!!

5a-12 over a^2-8a+15 - 3a-2 over a^2-8a+15

so far I have 5a-12-3a+2 over a^2-8a+15......now I am stuck! Help!!

Thank you so much!
ac
The sum of two areas of two circles is 128(pie)ft^2. The difference of the circumferences is 8(pie)ft. Find the radius of each circle.