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Mathematics 10 Online
OpenStudy (anonymous):

which ratios form a proportion? A.4/9 , 12/25 B.3/7 , 18/42 C.5/11 , 20/45 D.5/8 , 15/25

OpenStudy (amistre64):

a proportion is an equality if A and B are proportional, then for some scalar k, Ak = B

OpenStudy (anonymous):

so its B

OpenStudy (amistre64):

or, just cross multiply

OpenStudy (amistre64):

B is good

OpenStudy (anonymous):

ight thanks

OpenStudy (amistre64):

youre welcome

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