For the function f(x) = 4x - 1, what is f(21)?

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Multiple Choice

For the function f(x) = 4x - 1, what is f(21)?

Explanation:
Evaluating a function at a given input means plug the number into the function’s rule and simplify. For f(x) = 4x - 1, replace x with 21. That gives 4 × 21 − 1. Multiply first: 4 × 21 = 84. Then subtract 1: 84 − 1 = 83. So the value is 83. This shows applying the rule of a linear function to the input step by step: multiply by 4, then subtract 1.

Evaluating a function at a given input means plug the number into the function’s rule and simplify. For f(x) = 4x - 1, replace x with 21. That gives 4 × 21 − 1. Multiply first: 4 × 21 = 84. Then subtract 1: 84 − 1 = 83. So the value is 83. This shows applying the rule of a linear function to the input step by step: multiply by 4, then subtract 1.

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