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[ Mathematics ] Open Question : How do i find the half-life of this?

The time necessary for half of the radioactive material to decay is known as the half-life of the material. Find the half-life of C14. Given: y = be-kt k = 1.24 x 10-4 1/yr (HINT: the amount of radioactive material will be 1/2 of the original amount at the time corresponding to the half-life). HINT: this problem is very similar to finding the doubling time. Think about how this equation corresponds to the Nt = Noert equation. Answer = ________ years. (enter numeric value, without commas or units)

[ Biology ] Open Question : Avery, MacLeod, and McCarty determined that the substance responsible for changing live, nonvirulent bacteria?

1) Based on his experiments with bacterium S. pneumoniae, Griffith concluded that the genetic information for virulence was transferred from dead, virulent cells to live, nonvirulent cells, a process called ______. 2) Avery, MacLeod, and McCarty determined that the substance responsible for changing live, nonvirulent bacteria into live, virulent bacteria was _______. 3) Hershey and Chase radioactively labeled protein and DNA to demonstrate that the genetic material of ______ is DNA. Choices -cells -protein -complementary -replication -phages -RNA -bacteria -transformation -DNA