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Algebra / Linear functions Difficulty: Easy

The function f is defined by fx=710x+55. What is the value of f20?

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Explanation

The correct answer is 69. The value of f(20) can be found by evaluating the function f(x)=710x+55 for x=20. Substituting 20 for x in this function yields f(20)=710(20)+55, or f(20)=69. Therefore, the value of f(20) is 69.