Exposure to radioactive material is considered safe after 10 ...

[tiffannnnyyyyyy]

Exposure to radioactive material is considered safe after 10 half-lives because
 
  A) less than a tenth of 1 of the material remains.
  B) less than 12.5 of the material remains.
  C) ten is an even number.
  D) all of the material will have decayed at that time.

Question 2

Polyunsaturated fats have
 
  A) primarily CC bonds.
  B) a large proportion of C C bonds.
  C) one or more C C bonds.
  D) an odd number of carbon atoms.

[katara]

Answer to Question 1

A

Answer to Question 2

B

[tiffannnnyyyyyy]

Gracias!

[rachel]

Excellent