If a sample known to be about 10.740 years old has 400 carbon-14, how many atoms were in the sample when the oranism died?

Does the problem involve permutations or? combinations? do not solve. the matching section of an exam has 4 questions and 7 possible answers. in how many different ways can a student answer the 4 ? questions, if none of the answer choices can be? repeated?

20 da is equal to a. 2,000 cm. b. 2 m. c. 20,000 cm. d. 20,000 mm

What are “like terms”? why can we only add like terms?