1. Let D = the sales of DVDs in billions of dollars, S = the total sales of streaming videos in billions of dollars, and t = the number of years after 2009. D=−0.92⋅t+8.75D=-0.92⋅t+8.75  S=2.3+0.8⋅tS=2.3+0.8⋅t  a. In what year should the DVD sales drop below 1.7 billion? show work b. In what year do the models predict streaming video sales to exceed DVD sales? show work

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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.