Assignment:
Q1. Suppose that the average yearly cost per item for producing x items of a business product is C(x)=10+(100/x) if the current production is x=10 and production is increasing at a rate of 2 items per year, find the rate of change of the average cost.
Q2. Suppose a 6ft tall person is 12 ft away from a 18-ft tall lamppost. if the person is moving away from the lamppost at a rate of 2 ft/s, at what rate is the length of the shadow changing? (Hint: show that (x+s)/18=s/6.)
Q3. Suppose that a raindrop evaporates in such a way that it maintains a spherical shape. given that the volume of a sphere of radius r is V=(4/3)(phi)r², if the radius changes in time, show that V'=Ar'. If the rate of evaporation (V') is proportional to the surface area, show that the radius changes at a constant rate.
Provide complete and step by step solution for the question and show calculations and use formulas.