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Mathematics, 21.06.2019 23:20
Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g
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Mathematics, 22.06.2019 04:30
7x^2-9x+5=0 find the discriminant and number of real solutions
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Mathematics, 22.06.2019 05:30
When a number is decreased by 9.9% the result is 40. what is the original number to the nearest tenth? super urgent
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