Can someone kindly help me with these questions please? Thank you in advance.

The halflite of a certain tranquilizer in the bloodstream is 43 hours. How long will it take for the drug to decay to 91% of the original dosage'?l Use the exponential decay model, A=Au. to solve. |:| hours (Round to one decimal place as needed.) |n2 Use the formula t= T that gives the time for a population: with a growth rate k: to double, to answer the following questions. The growth model A: Son'uugl describes the population, A. of a country in millions, t years alter 2003. E} a. What is the country's growth rate? '3'}: b. How long will it take the country to double its population? years {Round to the nearest whole number.) 7. 12.67 A logistic growth model for world population, f(x), in billions, x years after 1984 is f(x) = 1 +4.15e- 0.026x According to this model, what is the limiting size of the population that Earth will eventually sustain? The limiting size of the population that Earth will eventually sustain is billion. (Type an integer or a decimal.) 8. An isosceles triangle containing two angles with equal measure is shown. The degree measure of each triangle's three interior angles and an extra angle is represented with variables. Find the measure of the three interior angles. x 2x - 21 y/ What is the measure of angle x? What is the measure of angle y? y =0