A long distance company charges a monthly fee of $4.95 and $0.02 per minute. Let f(x) be the monthly long distance bill and x represent the total minutes of long distance time during the month. What is the initial value of this function?

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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.