Algebra Practice Test

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Which expression represents the sum of 5a and 8a?

  1. 12a

  2. 13a

  3. 8a

  4. 40a

The correct answer is: 12a

The sum of 5a and 8a is calculated by simply adding the coefficients of the like terms. In this case, both terms are multiples of 'a', which means they can be combined. When you add 5a and 8a, you add the coefficients 5 and 8 together: 5 + 8 = 13 Then, you attach 'a' to the result, giving you 13a. Thus, while 12a represents a possible combination of terms, it is not the correct result of adding 5a and 8a together. The other options, including 8a, would represent a single term rather than a sum, and 40a does not relate to this addition at all.

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