21) A typical cup of coffee contains about 100 mg of caffeine. A specific energy drink contains 316 mg of caffeine. Assume caffeine leaves the body at a rate of 16% per hour. Use the formula A = C, (r) where Crepresents the amount of caffeine in mg, r is the rate of decay, t is time in hours, and Ais the amount remaining after t hours. If a person drinks this entire energy drink without any caffeine in their body to begin with, after how many hours will the body have 100 mg of caffeine remaining? Round your answer to the nearest whole number hour. A 3 В 4 5 D 6 E) 8

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Differential Equations

Have you ever observed the movement of the satellites and rockets or how the planets go around the sun in their orbits? How will you determine their motion? Definitely they follow some scientific laws and these kinds of problems are framed as differential equations.