exam Maths Puzzle Numerical Ability

-10 > or equal 2.5z

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exam Other Question

Simplify.

1+(1/3) over 1-(3/7) = ??????

I used the parentheses to show that, for example, it is not 1+1 over 3, but 1 plus 1/3. The same stands for the second part of the problem.
These are my questions:
3)Can you find the missing pieces given number of sides/angles/ etc.?
4)Is trigonometry helpful? Why? When would it be good to use? When would it not?
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