book Maths Puzzle Numerical Ability

An 8-inch-square picture is to be enlarged so it covers an area of 100 inches.How much longer will each side of the enlarged picture be?

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ok I am given the directions-Find the slope of the graph of the linear function f and the problem is....f(2)=-3, f(3)=9

how do i find the slope?
If they give you a problem that said dreaw on the number like that flooling set [-2,7) upside down U [5,10]
what does the u or upside down u mean