book Maths Puzzle Numerical Ability

I need help with simplifying expressions with fractions such as:

( 35 - 10q) ( - 2/5)

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I could not find any lessons for my brother on Adding and Subtracting algebraic fractions. Could you please help me. Could you also show me how to type in fractions. In this problem x is under x+2 then you add with x+1 under x. Thank you Could someone help me with this?
A right triangle has legs of lengths 7m and 9m. Which is the best estimate of the length of the hypotenuse? 10m,,11m,12m,13m