exam Maths Puzzle Numerical Ability

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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exam Other Question
-10 > or equal 2.5z Explain in your own words how to reverse FOIL when factoring a polynomial of the form ax2 + bx + c when a = 1. Give an example with your explanation.