exam Maths Puzzle Numerical Ability Averages

Does anyone know how to:

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

Thanks

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exam Other Question

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 Use the fundamental identities to write the expression in terms of a single trigonometric function.

(cscx/sexc - tanx) - (cscx/secx + tanx)