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Math Help - Algebra problem dealing with lengths

  1. #1
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    Question Algebra problem dealing with lengths

    If [ a ] = 5 cm , and [ b ] = 3a cm , find [ a + b ]

    ANSWER=
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  2. #2
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    \displaystyle a = 5, b=3a= 3\times 5 = 15 \implies a+b = 5+15=\dots
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  3. #3
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    the answer is?
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  4. #4
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    Take a guess, i dare you!
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