#### Multiple Choice Question (MCQ)

In terms of x , what is the average (arithmetic mean ) of 4x-2 , x+2 , 2x+3 , and x+1 ?

1. ×

2x-1

2. ×

2x

3. 2x+1

4. ×

2x+4

5. ×

8x+4

Collected in the board: Calculate algebraic expressions

Steven Zheng posted 6 months ago

1. The arithmetic mean is defined as \dfrac{a_1+a_2+\dots+a_n}{n}, in which a_n could be algebraic expression.

Here the average (arithmetic mean ) of 4x−2 , x+2 , 2x+3 , and x+1 is

\dfrac{4x-2+x+2+2x+3+x+1}{4}

= 2x+1

C is correct choice

Steven Zheng posted 3 months ago

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