The sum of two numbers a and b is 20. Write an expression for the sum of their squares, in terms of a.

2a² - 40a + 400

Step-by-step explanation:

a + b = 20

b = 20 - a

a² + b² = a² + (20 - a)²

a² + b² = a² + 20² - 40a + a²

a² + b² = 2a² - 40a + 400

the answer is: the length is 5/6 yards.

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