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What are correct trigonometric ratios that could be used to determine the length of ln

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?

Could someone me with this question i’ve been stuck on it for 20 minutes