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September 23, 2014

September 23, 2014

Posted by **Belle** on Monday, June 6, 2011 at 8:07pm.

- College algebra -
**bobpursley**, Monday, June 6, 2011 at 8:09pmWouldn't it be great to see the four choices?

- College algebra -
**M**, Thursday, July 21, 2011 at 10:02pmAt least, from the sign of a, one can tell whether it is concave upward or downward

a>0 => concave upward.

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