Mathematics, 22.06.2019 23:50, azaz1819
Ne of the problems of in-air testing of nuclear weapons (or, even worse, the use of such weapons! ) is the danger of radioactive fallout. one of the most problematic nuclides in such fallout is strontium-90 (90sr), which breaks down by β− decay with a half-life of 28 years. it is chemically similar to calcium and therefore can be incorporated into bones and teeth, where, due to its rather long half-life, it remains for years as an internal source of radiation. part a what is the daughter nucleus of the 90sr decay? what is the daughter nucleus of the decay? 9039y 8537rb 8436kr request answer part b what percent of the original level of 90sr is left after 56 years? nothing % % request answer part c how long would you have to wait for the original level to be reduced to 6.25{\rm %} of its original value?
Answers: 1
Mathematics, 21.06.2019 18:00, kezin
The sat and act tests use very different grading scales. the sat math scores follow a normal distribution with mean 518 and standard deviation of 118. the act math scores follow a normal distribution with mean 20.7 and standard deviation of 5. suppose regan scores a 754 on the math portion of the sat. how much would her sister veronica need to score on the math portion of the act to meet or beat regan's score?
Answers: 1
Mathematics, 21.06.2019 21:00, palomaresmitchelle
Which expression is equal to (21)(7)(3x) using the associative property? (21 · 7 · 3)x (7)(21)(3x) 32(7 + 3x) (3x)(7)(21)
Answers: 2
Mathematics, 21.06.2019 23:20, savannahvargas512
For which pairs of functions is (f•g)(x)=12x? f(x)=3-4x and g(x)=16x-3 f(x)=6x2 and g(x)= 2/x f(x)= and g(x) = 144x f(x)=4x and g(x) =3x
Answers: 1
Mathematics, 22.06.2019 00:20, kellygaytan
20 ! need ! which exponential function is represented by the table? f(x) = 0.2(0.5x)f(x) = 0.5(5x)f(x) = 0.5(0.2x)f(x) = 0.2(0.2x)
Answers: 1
Ne of the problems of in-air testing of nuclear weapons (or, even worse, the use of such weapons! )...
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