Question: Question 3 Solve the linear differential equation x2 E + 2xy = sec2 x. Question 4 In 2001, population in Sweden was estimated to be

Question 3 Solve the linear differential equation x2 E + 2xy = sec2 x. Question 4 In 2001, population in Sweden was estimated to be about 20 million. After two years, the population increases to 25.4 million. Show that the equation of population, P at any time, t is Pct) = 2090-1195 - Question 5 A radioactive isotope has a half-life of 16 days. An experiment begins with 160 grams of the radioactive isotope. How much radioactive isotope should leave at the end of 35 days

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