Advanced MathEasyPerimeter with an expression for the length
Advanced Math practice question
A rectangle has length 3x + 1 and width 2. Which expression gives its perimeter?
- A. 6x + 6Correct
- B. 3x + 3
- C. 6x + 2
- D. 5x + 1
Answer: A. 6x + 6
2(3x + 1) + 2(2) = 6x + 2 + 4 = 6x + 6.
Why the other answers are wrong
- B. 3x + 3
- Adds one length and one width only.
- C. 6x + 2
- Doubles the length but forgets the widths.
- D. 5x + 1
- Adds the length and the width without doubling.
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