Answer:Understanding the Speed of SoundGiven: Temperature = -20°CAsked: Speed of soundFormula: * The speed of sound in air can be approximated using the following formula: * v = 331.4 + 0.606T * where v is the speed of sound in meters per second and T is the temperature in degrees Celsius.Substitution: * v = 331.4 + 0.606(-20)Calculation: * v = 331.4 - 12.12 * v = 319.28Answer: * The speed of sound at -20°C is approximately 319.28 meters per second.