Mathematics, 07.07.2020 16:01, bryan519688
The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at time t and has a half-life of 3.3 hours. If 1 gram of this isotope is present initially, how long will it take for 95% of the lead to decay?
Answers: 2
Mathematics, 21.06.2019 13:30, alexthebest3976
Given: △abc, ab=15, bd=9 ad ⊥ bc , m∠c=30°. find: the perimeter of the triangle.
Answers: 1
Mathematics, 21.06.2019 18:00, MayFlowers
Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.
Answers: 1
Mathematics, 21.06.2019 20:50, kidpryo1
There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?
Answers: 1
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