Respuesta :

saturns
the first one is a valid proportion because when simplified they equal the same

(3/4 is simplified, and 21/28 can be simplified by dividing both the numerator and denominator by 7, you get 3/4 which is equal to 3/4)
texaschic101
3/4 = 21/28 <=

proportions are nothing but equivalent fractions

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