How do you simplify the expression 20 - 3a + 5 - 7?

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Multiple Choice

How do you simplify the expression 20 - 3a + 5 - 7?

Explanation:
To simplify the expression 20 - 3a + 5 - 7, you begin by identifying and combining the like terms, which in this case are the constant numbers. First, combine the constants: - Start with 20 and add 5, which gives you 25. - Then, subtract 7 from 25, resulting in 18. After simplifying the constants, the expression can be rewritten as: 18 - 3a. The term -3a remains unchanged since it is not combined with any other like term. Therefore, the final simplified expression is 18 - 3a. This reasoning leads to the conclusion that 18 - 3a is the simplest form of the expression, confirming the correctness of the chosen answer.

To simplify the expression 20 - 3a + 5 - 7, you begin by identifying and combining the like terms, which in this case are the constant numbers.

First, combine the constants:

  • Start with 20 and add 5, which gives you 25.

  • Then, subtract 7 from 25, resulting in 18.

After simplifying the constants, the expression can be rewritten as:

18 - 3a.

The term -3a remains unchanged since it is not combined with any other like term. Therefore, the final simplified expression is 18 - 3a.

This reasoning leads to the conclusion that 18 - 3a is the simplest form of the expression, confirming the correctness of the chosen answer.

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