Which one of these is an example of a physical change? a. sugar dissolving in warm water. b. iron rusting in the presence of moist air. c. wood burning in the presence of oxygen. d. baking soda reacting with acid to form with acid to form a gas.

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 the answer is terrae but not 100 percent sure. ▓▬▬ §