College Algebra

Solve the following exponential equations, showing all work.

• 2.
• 4. e2-x

5. Given the following investment options, decide which one would benefit you the most after 6 years (make sure you show all work)

a) You invest $5000 at 9.5% compounded monthly

b) You invest $4500 at 8.25% compounded daily

c) You invest $4750 at 9% compounded continuously

6. A certain strain of bacteria grows exponentially according to the model

P(t)= P˳ is the initial population, k is the relative rate of growth, t is time in hours and P (t) is the population of bacteria for time t. Suppose we begin with 5 bacteria. After 1 hour, the number of bacteria has grown 75. How many bacteria will be present after 6 hours

7. The house down the street has termites in the porch. The exterminator estimated that there are about 525,000 termites eating at the porch. He said that the treatment he put on the wood would kill 32% of the termites every day. How many termites will be eating at the porch in 3 days

For the following questions, write them in logarithmic form

8. 9.

10. 11. 13° = 1

For the following questions, write them in exponential form

12. log₂ 8=313. Log₂ =

14. log = – 115. Logɾ s= t

Expand each expression using the properties of logs

16. log₃ (/y)17. Log₂ / )

Write each expression as a single logarithm

18. 2 log(x) + 3 log(y) – log(6)19. 5 log(a) – 7 log(a) – 2log(6)

Use a calculator to find an approximation to the nearest thousandth for each of the following.

20. log.511421. Log 45,000

22. ln 12,00023. Ln 1.9

Solve each exponential or logarithmic equation. Show all work

24. log₂ (x – 1) – log₂ (x + 2) = 225. = 7

26. + 3=1027. log₄ (x + 2) = log₈ 8

28. ln(2x) – ln(x – 3) = 129. + 3 = 8

Determine whether the functions are inverses by using the composition of functions

30. f(x) = 6x + 42

g(x)=⅙x-7

31. f(x) =

g(x) = (x-2) + 1

For each function, find out whether it is one-to-one. If the function is one-to-one, then find its inverse

32. f(x) = 3x + 233. f(x) = 3x – 5

34. f(x) =