** Related rate problems** take into consideration how a change in one quantity results in a change in another country. For example, when blowing up a balloon, the surface area of the balloon is changing, and so is the volume of the balloon. The rate at which the volume out these problems of the balloon changes will determine the rate at which the surface area of the balloon is changing. The two rates are

Here is a basic problem-solving strategy that may help when setting up related rates problems. Related rates problems usually involve functions that are changing **with respect to time.** *It will be very important to identify the independent variable and write down appropriate formulas from geometry and trigonometry.*

*Read the problem carefully.*

*Draw a picture.*

*Identify the variables used to represent the quantities under consideration.*

*Interpret the rate information given as a derivative.*

*Write an equation that relates the various quantities involved in the problem. Use the geometry and trigonometry to relate some of the variables to each other to help eliminate them from the equation.*

*Differentiate the equation with respect to time by using the chain rule and then solve for the appropriate quantity.*

*Re-read the question to make sure that you have answered it completely.*

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