I need help please answer what is the activity in 2053 if in 2017 was 25kBq and the half life is 12?

Aresearcher plans to conduct a test of hypotheses at the 1% significance level. she designs her study to have a power of 0.90 at a particular alternative value of the parameter of interest. the probability that the researcher will commit a type ii error for the particular alternative value of the parameter at which she computed the power is: a. 0.90. b. 0.01. c. 0.10. d. equal to 1

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

Which property of fossils allow scientists to determine the relative rock ages..