Posted by derek on Friday, May 30, 2008 at 11:38pm.
This looks like a question posted earlier today, except in this case 7x + 15 has replaced 7x - 15.
Add up all angles, set the sum equal to 180, and solve for x. Then compute the angles and decide what kind of triangle it is. This time it WILL be one of the 4 choices. Last time it wasn't.
acute triangle
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