8x + 58 ≥ 500 i dont know what to do HELP ME

If 50% of a number is 14 then 100% of the number is

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?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base