What is the unit rate $300 for 13 ft2?

What are the soultion(s) to the quadratic equation 40- x^2=0

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?

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have