Can someone answer this question please answer it correctly if it’s corect I will mark you brainliest

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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?

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)