Suppose you bought supplies. three rolls of streamers and 15 party hats cost $30. later, you bought 2 rolls of streamers ad 4 party hats for $11. solve a system of equations to determine the cost of streamers and party hats, find their costs.

20 da is equal to a. 2,000 cm. b. 2 m. c. 20,000 cm. d. 20,000 mm

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

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?