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Mathematics for IGCSE & O level - Equations (Section 5 - No. 1)

Which of the following is the correct expression for the area of a rectangle with length (x + 5) and width 3?
3x + 5
3x + 15
x + 8
3x

解释

Area = length * width, so 3 * (x + 5) = 3x + 15.

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