Write the following proportion using colons. 7 is to 21 as 3 is to 9.

A. 7:21 = 9:3

B. 7:3 = 21:9

C. 21:7 = 3:9

D. 7:21 = 3:9

What is the sum of 3 and a number

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The line parallel to the x axis and 6 units below it

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