The width of the rectangle is 2 cm. What is the length if the perimeter is 20 cm?

Let the length of the rectangle be equal to y, then using the formula P = 2a + 2b, where P is the perimeter of a rectangle with length a and width b, we compose the equation:
2 * 2 + 2 * y = 20,
4 + 2y = 20,
2y = 20 – 4,
2y = 16,
y = 16/2,
y = 8 cm.
Answer: The length of the rectangle is 8 centimeters.

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