book Maths Puzzle Numerical Ability

(2X+3Y)^5-9(2X+3Y)^3

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book Other Question

could you show me what a 8cm mass or circle would be equilivant to? I would greatly appreciate your help and thank you in advance.

The formula v= the square root 2.5 r models the safe speed, v, in miles per hour, at which a car can travel on a c