document.write( "Question 1040503: Let f (x) = x^2 + 18x + 84\r
\n" ); document.write( "\n" ); document.write( "(a) Find the vertex. Answer: ________
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\n" ); document.write( "(c) On what interval is the function decreasing? Answer: ________
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Algebra.Com's Answer #655348 by ikleyn(52835)\"\" \"About 
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