exam Maths Puzzle Numerical Ability

Can someone help me on this problem?

I need to find the constant of variation k

m varies directly with n; m = 144 when n = 8

Thanks,
Ashley

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exam Other Question

need help with these 2 problems.Thanks for all your help.
write the equation of each root

1. 6, -2/3

2. -3/4, -8 Does anyone know how to:

Find the inverse of the function,f(x)=√(7&x ) (seventh root of x).

Thanks