英语翻译
Evaluatetheexpression4(2X+3)+2(X+1)-7foreachvalueofX.
A.1
B.6
C.22
D.12
E.Simplifytheexpression.WhenyouevaluatethesimplifiedexpressionforX=1andX=6,doyougetthesameresultsasinpart(a)andpart(b)?
Doyougetthesameresultforanyvalueof
2.Whyarevariablesuseful?
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