Intermediate Algebra Exam #4

Click on the 10 question exam covering topics in chapter 7. Give yourself one hour to try all of the problems and then come back and check your answers.

IA Sample Exam #4 ]
8. A $1,000 investment is made at an annual interest rate of  7 3/4% that is compounded quarterly.  How long will it take the investment to double?
9. Francium-223 has a half-life of about 22 minutes. How much of a 3-microgram sample of francium-223 will be left after 5 minutes of decay? Round off answer to the nearest hundredth of a microgram.
10. In the year 2000 a certain small town had a population of 72,000 people.  In the year 2010 the population was estimated to have grown to 108,000 people. If the population continues to grow exponentially at this rate, estimate the population in the year 2016.