A 20.0 L gas at 150. Celsius was cooled to 15.0 Celsius. What will be the new volume of the gas if the number of moles and pressure of the gas remain unchanged

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

i think it is true since you can test the answer and can use observations to complete it.