exam Maths Puzzle Numerical Ability

please help me with the following :

4 + c / 4y^2

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exam Other Question

Please help!
Completly factor the following:
3x^3y - 12x^2y + 9xy

This is as far as I got 3x x y

Thanks,

Lackinmath Please clarify the solution for me. Thank you

find the product
(10+7x)^2

I believe it is 100+49x^2 is this correct?