Math Prob 21?

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A number y varies jointly as x and one over the square root of z. If y=300 and x=5 and z=9, what is y when x=18 and z=36?

2006-12-31 04:19:23 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

540

2006-12-31 04:33:58 · answer #1 · answered by Anonymous · 0⤊ 0⤋

2006-12-31 12:25:13 · answer #2 · answered by dude 5 · 0⤊ 1⤋

y = a(x/âz)

300 = a(5/â9) = (5/3)a
a = 900/5 = 180

y = 180(x/âz)
y = 180(18/â36) = 180(18/6) = 180(3) = 540
y = 540

2007-01-01 02:45:30 · answer #3 · answered by Northstar 7 · 0⤊ 0⤋