book Maths Puzzle Numerical Ability

I am having more problems i understand now the last one i submitted but i have TWO problems i cant understand
here is one
During one week Dow Jones Industrial average, the most

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book Other Question

hilary is trying to determine the cost of health care to college students and parents' ability to cover those cost. She assumes that the cost of one year of health for a college s please help with this problem.
Factor completely.

x^2 + 4xy - 21y^2
thanks