exam Maths Puzzle Numerical Ability

adding like terms
simplify
4x^2y+3xxy-2xyy-10x^2-y^2x

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exam Other Question

find the slope of the passing through the following points:
(2, 0) and (0, -4)

A. 2
B. -2
C. 1/2
D. -1/2

Thank you for any help... Hello,

which would be the greatest common factor for each goup of terms for :

a) 48 , 36x

b) 9wx, 21wy, 15xy

thank you.