exam Maths Puzzle Numerical Ability

Simplify. Assume x represents a positive number.

square root of 45x^4

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exam Other Question

Mercy can prepare a manuscript in 6 hours. Eunice can prepare it in 4 hours. How Long would it take them to preapre the manuscript together? 2 (x+4)= 3x
Just looking for an example close to this.
I got as far as...
2x + 8 = 3x
then do I subtract 2x from each side or 8?