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OpenStudy (anonymous):
Which ratios form a proportion? 4/9,12/25 3/7, 18/42 5/11, 20/45 5/8, 15/25 PLEASE HELP. MY GRADE DEPENDS ON IT.
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jimthompson5910 (jim_thompson5910):
4/9 = 12/25 4*25 = 9*12 ... cross multiply 100 = 108 ... which is false so 4/9 = 12/25 is not true and 4/9,12/25 don't form a proportion
jimthompson5910 (jim_thompson5910):
do the same with the rest
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