<PRE><B>Question 829277</B>
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relative speed of two trains:
60 + 55 = 115 kph
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s = d/t
t = d/s
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t = 575/115
t = 5 hours
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Solve and graph linear equations:
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Solve quadratic equations, quadratic formula:
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Solve systems of linear equations up to 6-equations 6-variables:
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