Pls help me What is the speed of light? (Select all that apply.)
The speed of light is the speed at which your eyes process colors.
The speed of light is the speed at which light waves travel.
The speed of light is 1 mi/sec.
The speed of light is 186,000 mi/sec.

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