A certain drug has a half-life in the body of 4.0h. What should the interval between doses be, if the concentration of drug in the body should not fall below 15.% of its initial concentration? Round your answer to 2 significant digits.

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

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