Respuesta :

[tex]26)\ \underline{\underline{0.5b^{2}}}[/tex]

[tex]27)\ \underline{\underline{6x + 7}}[/tex]

[tex]28)\ \underline{\underline{30 + 3x^{2}}}[/tex]

In questions 27 and 28, the unknown is called x.


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