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OpenStudy (anonymous):
Find an equation of joint variation. Then solve for the missing value. r varies directly as s and t. One set of values is r = 28, s = 7, t = 8. Find r when s = 12 and t = 9.
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OpenStudy (paxpolaris):
\[\Large {r_1 \over s_1t_1}= {r_2 \over s_2t_2}\]
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