exam Maths Puzzle Numerical Ability

Thank you in advance for your help with this problem. f(x)=sqrt5x+1 I am looking for the domain. thanks again.

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exam Other Question

What is the height of a right cylinder with radius 4 and volume 96(pi) cubic units? Solve for x.

1/x + 1/x+16 = 1/15

The solutions are x = ________.