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OpenStudy (anonymous):
If a/4 = 9/a, then a²=36 4a = 9a a + 4 = 9 + a a - 4 = 9 - a
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OpenStudy (anonymous):
first one
OpenStudy (imstuck):
You would cross multiply here. a times a = 9 times 4. What does that give you when you multiply it out?
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