
Concept explainers
For Exercises 87-90, use the Tangent feature from the DRAW menu to find the rate of change in part (b).
Growth of a retirement fund. Maria deposits $20,000 in an IRA whose value increases by 5.6% every year. The value of the IRA after t years is modeled by
a. Use the model to estimate the value of Maria’s IRA after 7 yr.
b. What is the rate of change in the value of the IRA at the end of 7 yr?
c. When will Maria’s IRA have a value of $40,000?

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Chapter 3 Solutions
Calculus and Its Applications (11th Edition)
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