Approximately 9 out of 10 smokers began smoking before the age of 21. In a group of 400 smokers, about how many of them started
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well, let's notice something, we have two 45° angles, now each of those will give use an equal opposite side, namely if that one side is "x", the other is her twin, "x" as well.
is a right-triangle, so we can use the pythagorean theorem, and we know the sides are x,x,6.