¿Qué significa que las funciones exponencial y logarítmica sean inversas?

What is the base of 1/9 to the power of 2

The total cost of anja’s trip to the dentist was $628.35. she paid a flat fee of $89.95 which included the checkup and cleaning and then had 4 cavities filled, each of which cost the same amount. which shows the correct equation and value of x, the cost of each cavity filling?

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