Final answer:
The function that represents the cost (C(x)) to produce x calculators is most likely a quadratic equation, and the correct option is A) Quadratic formula.
Step-by-step explanation:
The function that represents the cost (C(x)) to produce x calculators is most likely a quadratic equation. The correct option from the given choices is A) Quadratic formula. A quadratic equation is of the form ax² + bx + c = 0, where a, b, and c are constants. The quadratic formula, which gives the solutions to a quadratic equation, is:
x = (-b ± sqrt(b² - 4ac)) / (2a)