A radioactive source 's activity falls from 8:000 counts per minute to 500 counts per minute in
20hours. What is the half-life of the source?
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Let v1, v2, w be three linearly independent vectors in r 3 . that is, they do not all lie on the same plane. for each of the following (infinite) set of vectors, carefully sketch it in r 3 , and determine whether or not it is a vector space (i.e., a subspace of r 3 ). explain your reasoning

Which is not one of the major climate zones? question 3 options: rain forest polar tropical temperate

Aballet student who learns with the of his instructor is demonstrating learning.