Provide an appropriate response.An investor purchased 500 shares of a stock at $19 per share. The commission she paid to buy the stock was $65 plus 0.3% of the principal amount. Six months later she sold the stock for $20.50 per share. If she paid the same rate of commission to sell the stock, what annual rate of interest (annual yield) did she earn on her initial investment (including purchase price plus commission)? Express your answer as a percentage, correct to one decimal place.
Fill in the blank(s) with the appropriate word(s).
11.7%
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Express the integrand as a sum of partial fractions and evaluate the integral. 
A. 64 ln 
- 
B. 12 ln 5 - 
C. 48 ln 5 - 12ln 4 + 
D. 48 ln 
- 
Solve the problem.A certain radioactive isotope has a half-life of approximately 950 years. How many years to the nearest year would be required for a given amount of this isotope to decay to 75% of that amount?
A. 394 years B. 319 years C. 1900 years D. 238 years
Subtract.14.9 - 2.56
A. 17.46 B. 12.34 C. 12.44 D. 18.46
Solve the problem.The population of a town was about 40,000 in 1910. In 1935, the population was about 85,000. Assuming the exponential model, what was the growth rate of the town, to the nearest hundredth of a percent, during this period?
A. 30.15 % per year B. 3.32 % per year C. 3.02 % per year D. 1.68 % per year