Under a dilation, triangle XYZ where X (4, 7), Y (-3, 8), and Z (-2, - 1) becomes triangle X'Y'Z' where X' (4/3, 7/3), Y' (-1, 8/3), and Z' (-2/3, - 1/3). What is the scale factor for this dilation?

A. 1/2

B. - 1/3

C. - 3

D. 3

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Use a proportion to find the missing side length, x. Triangle A B C dilated to form triangle D E F. In triangle A B C, side A B measures 10 and side B C measures 4. In triangle D E F, side D E measures x and side F E measures 2.

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A number is shown in word form. "Two hundred thirteen thousand, forty-nine" What is the number in standard form?