Suppose that y varies inversely with x, and y=3 when x=5. what is an equation for the inverse variation

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?

Shannon drove for 540 minutes. if she traveled 65 miles per hour,how many total miles did she travel?

Cate purchases $1600 worth of stock and her broker estimates it will increase in value by 4.2% each year. after about how many years will the value of cate's stock be about $2000