exam Maths Puzzle Numerical Ability

multiply in the vertical form
(mē-5mn+3nē)(mē+4mn-2nē)

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exam Other Question

Working together on a job patrice by himself can paint four rooms in 10 hours. if he hires april to help they can do the same job together in 6 hours. if he lets april work alone how long will it take her to paint 4 rooms. I need to find x and y ranges for the following problems and then graph accordingly. I need very detailed information and step by step help, if you can. I need to understand this. THANK YOU!!!
1. f(y)=-5y+3 2. f(x)=x^2-2x+1