book Maths Puzzle Numerical Ability

I'm not sure how to get the square root of 15/24y^5
Could you help me? thanks!

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book Other Question

Can you help me please?
If the cost equation for a product is give by C=2x^2+32, find the marginal cost. How would I find this? I'm not sure how to divive using long division with polynomials. Could someone help me with this Thanks.
Use long division to reduce (6x^5 - 5x^4 - 6x^3 - 10x^2 + 21x - 9)/(2x - 3