exam Maths Puzzle Numerical Ability

I need to factor completly

x^8-1
and
y^3+125

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exam Other Question

At a given hour, two cars leave a city in the same direction. One travels at 60 mph, and the other travels at 75 mph. In how many hours will the cars be 90 miles apart? i dont understand these types

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