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M varies jointly as q and r. One set of values is m = 86.4, q = 9, and r = 12. Find m when q = 20 and r = 6.5.

M varies jointly as q and r. One set of values is m = 86.4, q = 9, and r = 12. Find m when q = 20 and r = 6.5.
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m varies jointly as q and r. One set of values is m = 86.4, q = 9, and r = 12. Find m when q = 20 and r = 6.5.

User Hbgamra
by
8.0k points

1 Answer

5 votes
M=kqr
k=constant of propoertionality

86.4=k(9)(12)
86.4=108k
divide both sides by 108
86.4/108=k

M=(86.4/108)qr

q=20
r=6.5
M=(86.4/108)(20)(6.5)
M=104
User Siddique Mahsud
by
8.3k points
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