exam Maths Puzzle Numerical Ability

i dont understand these types

-3(-3)(-2 - 5 + |-11|)

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exam Other Question

I need to factor completly

x^8-1
and
y^3+125 2 planes leave Newyork AT 10am, one heading for Europe at 600mph and one heading in the opposite direction at 150mph. At what time will they be 900 miles apart?