the total US disposable income, in billions, can be modeled by D(t) = 10,020e^0.02292t where t is the number of years past 2010. in what year is disposable income predicted to be $15 trillion (that is, $15,000 billion)

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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.