neariah24
23.07.2019 •
Mathematics
3/7 =9/x solve the following proportions ( they are fractions) !
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Ответ:
cross multiply because thats how u solve proportions
(3)(x) = (7)(9)
3x = 63
x = 63/3
x = 21
and if u will notice : 3/7 and 9/21 9/21 reduces to 3/7so these are equivalent fractions...because proportions are nothing but equivalent fractions
Ответ:
(5.49 dollars) / (10 discs) = (5.49/10) dollar/disc = 0.549 dollar per disc