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OpenStudy (rebeccapink6398):
WILL MEDAL+FAN!!! how do i cross multiply? PLEASE DO NOOOOT give me the answer. I would like to learn it :) 13/x = 39/87
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OpenStudy (adamk):
13 x 87 = 39 x "x"
OpenStudy (anonymous):
Heres a website that might help : http://www.ehow.com/how_8389522_cross-multiply.html?ref=Track2&utm_source=ask
Directrix (directrix):
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