Which relationship between x and y in the equation shows a proportional relationship?

A: y + 5 = x + 3

B: y = 5 (x + 3)

C: y = 5x + 3

D: y=3x

You guys are smarter than me,

George won 7 of the 16 math completions he entered. To the nearest thousandth find his winning average

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8 less than a number n is less than 11

9a - [7 - 5 (7a - 3) ]