exam Maths Puzzle Numerical Ability

Evaluate b^2-3ab when a=3 and b=-2.

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exam Other Question

(c^-1)^-12(c^-5)^6/(c^-4)^0(c^3)^-3

answer 1/c^9

How do I get there? I am so lost! please help Find a vector that has the same direction as 3i - 7j and twice the magnitude.