Posted by JO on Sunday, July 20, 2008 at 8:50pm.
Use your calculator to evaluate the following expression if x = –2.57, y = 1.55, and z = –1.98. Round your answer to the nearest tenth.

algebra  drwls, Sunday, July 20, 2008 at 8:56pm
Since you already told us what x, y and z are, what is there to evaluate?
You seem to have left out what you call the "following expression", which is a probably formula of some kind that involves x, y and z.
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