book Maths Puzzle Numerical Ability

-2y-(3k-2y)+3k

which expression is the GCF of 12x^3 and 32xy

Evaluate 4m-5/n for m=5,n=25

Please answer these questions quickly

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book Other Question

use two unit multpliers to convert 366 centimeters to feet. thanks My book says that the solution of this problem:

[ (x^2 - y^2) / (4x + 4y) ] / [ (3y - 3x) / (12x^2) ]

is (-x^2) , but no matter what I do, I can only find x^2.
Help. Thank you.