exam Maths Puzzle Numerical Ability

3a+9/a*a^2/a^2-9 Find the product

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exam Other Question

I will try to write this correctly -

5^x-1 = 125^2x+3 ( the x-1 and 2x+3 should all be in superscript and raised)
HELP
need to solve

thank
lucy How would I simplify the square root of 3x over 2?