exam Maths Puzzle Numerical Ability

Please help me solve this equation:

5x^-4 after the little arrow its suppose to be a negative 4. So its 5 times x and then a negative exponent which is negative 4

Thank You

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exam Other Question

State the domain of the following:
h(x)=3x^2+5x-3

m(x)=3/x^2+7
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