Concept explainers
For Exercises 87-90, use the Tangent feature from the DRAW menu to find the rate of change in part (b).
Stock prices. The value (price) of a share of stock in Barrington Gold was $90 on June 15, 2014, and was increasing by 3% every week.
a. Find an exponential model for the value, V, of a share of the stock, in dollars, t weeks after June 15, 2014.
b. What was the rate of change in the value of a share of the stock 6 weeks prior to June 15, 2014?
c. Use the model to estimate the value of a share of the stock 6 week prior to June 15, 2014.
d. How many weeks after June 15, 2014, will the stock’s share value have doubled?
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