exam Maths Puzzle Numerical Ability

Hi

I need some help on my homework which i am finding difficulty of doing. The question is

Q1. Not everyone has the same pulse rate - and pulse rate can be affected by a

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exam Other Question
Multiply out

(x+6)(x^3-x^2-5x+1)

Please help If y varies directly with x, and y = 280 when x = 400, find the constant of variation k.