An archeology student found a coin at a dig. She determined that the mass of the coin is 4.51 g and its volume is 0.49 cm ^3 . Using the the table below, what metal is the coin most likely made of?

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3