A manufacturer of graphing calculators has determined that 9,000 calculators per week will be sold at a price of $90 per calculator. At a price of $85, it is estimated that 11,000 calculators will be sold. Determine a linear function that predicts the number of calculators that will be sold per week at a price of x dollars. y =        Use this model to predict the number of calculators that will be sold at a price of $70.

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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.