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Someone please help with these three questions

Someone please help with these three questions-example-1
User Krowi
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26)\ \underline{\underline{0.5b^(2)}}


27)\ \underline{\underline{6x + 7}}


28)\ \underline{\underline{30 + 3x^(2)}}

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


User Jaabh
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