In reply to a student's question, a guard in a natural history ...

[aabwk4]

In reply to a student's question, a guard in a natural history museum says of the fossils near his station, When I started work here twenty-four years ago, they were 80 million years old, so you can add it up. Which of the following is the best conclusion that the student can make regarding the age of the fossils?
   
  1.The fossils are less than 80,000,000 years old.
  2.The fossils are still about 80,000,000 years old.
  3.The fossils are 80,000,024 years old.
  4.The fossils are more than 80,000,000 years old.

Question 2

Within what percentage of the correct value would you expect an order-of-magnitude calculation to result?
  1.100
  2.10
  3.1000
  4.1

[tranoy]

Answer to Question 1

2

Answer to Question 2

4

[aabwk4]

Excellent

[smrtceo]

Gracias!