5. Which of the following is a way that scientists communicate their results to others? a. speak at a conference
b. write scientific articles
c. exchange information on the Internet
d. all of the above

6. 4.832 has 4 significant digits as a result of which rule?

a. All nonzero numbers are significant.
b. Zeros between nonzero digits are significant.
c. Final zeros after the decimal point are significant.
d. Zeros used solely for spacing the decimal point are not significant.

7. Which digits are significant in 0.045?

a. both zeros only
b. 4 and 5
c. 0, 4, and 5 to the right of the decimal
d. All digits are significant.