The population of India was about 1,380,000,000 people in 2020. Which number best approximates the population as a single digit times a power of
10?
O A. 1x 109
B. 1x 10-9
C. 3 x 108
O D. 3 x 10°

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

What is the radical expression that is equivalent to the expression 27 1 over 5?