book Maths Puzzle Numerical Ability

what is the square root of 400 and 900

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The revenue (in millions of dollars) from the sale of x units at a home supply outlet is given by r=.21x. The profit (in millions of dollars) from the sale of x units is given by p HEY! I would really appreciate help with this problem. Right now we're dealing with functions and graphs so I think it needs to be set up like that. It would help if you could put