exam Maths Puzzle Numerical Ability

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

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exam Other Question

Stan invested $5,000, part at 8% and part at 17%. If the total interest at the end of the year is $490, how much did he invest at 8%?

thank -6+x/4=-5 This is a fraction equation with negative. I am trying to help and have forgetten how to do these. Thank you so much for your help. Robin