a marketing manager states that the sales of a certain commodity will decline exponentially once the advertising campaign for the commodity is terminated. it is found that 21,000 units are being sold at the time of termination and 5 weeks later the sales level is 19,000 units. - find a function $(t) that gives the sales level t weeks after termination of advertising and determine what sales should be 8 weeks after termination of advertising.

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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.