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The two triangles are similar.

What is the value of x?

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x =

Which rational number could be graphed between -4 and -5

Bob is putting books on a shelf and takes a break after filling 18 1/2 inches on the book shelf. the book shelf is now 2/3 full. how long is the entire bookshelf?

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle