Question

Which procedure is used in related rates?

Options

• First find marginal cost, then differentiate.

• First differentiate the units, then find an equation.

• First connect the variables by an equation, then differentiate.

• First substitute the given value, then connect the variables.

Answer 1

In related rates, the variables must first be connected by an equation.
After forming that equation, differentiate it to relate their rates of change.