exam Maths Puzzle Numerical Ability

x2+y4=3(z+h)

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exam Other Question

Given the functions f(x)=sqrt-3x+15 and g(x)=5/x, determine g * f(x) and find its domain.

*please note that the question has a small o where I have placed an * symbol. I am not sure what that means.

Please someone help me. 2/3k=3/4 its been years and i cant remember the correct way to find what k is . thanks