exam Maths Puzzle Numerical Ability

Factor.

7t-21w-wt+3w^2

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exam Other Question

30x^3 y^4
6x^9 y^-4 PLEASE HELP. TOPIC: FINDING THE CONSTANT OF VARIATION

FIND THE CONSTANT OF VARIATION k.

M VARIES DIRECTLY WITH N;
M=144 WHEN N=8

THANKS
JMS