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# Several problems on exponential and logarithmic functions

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1) Find the domain of the following:

2) Describe the transformations on the following graph of ... . State the placement of the horizontal asymptote and y-intercept after the transformation. For example, left 1 or reflected about the y-axis are descriptions.

3) Describe the transformations on the following graph of ... . State the placement of the vertical asymptote and x-intercept after the transformation. For example, left 1 or stretched vertically by a factor of 2 are descriptions.

4) The formula for calculating the amount of money returned for an initial deposit into a bank account or CD (certificate of deposit) is given by ...

A is the amount of the return.
P is the principal amount initially deposited.
r is the annual interest rate (expressed as a decimal).
n is the number of compound periods in one year.
t is the number of years.

Carry all calculations to six decimals on each intermediate step, then round the final answer to the nearest cent.

Suppose you deposit \$2,000 for 5 years at a rate of 8%.

a) Calculate the return (A) if the bank compounds annually (n = 1). Round your answer to the hundredth's place.

b) Calculate the return (A) if the bank compounds quarterly (n = 4). Round your answer to the hundredth's place.

c) Does compounding annually or quarterly yield more interest? Explain why.

d) If a bank compounds continuously, then the formula used is ...
where e is a constant and equals approximately 2.7183.
Calculate A with continuous compounding. Round your answer to the hundredth's place.

e) A commonly asked question is, "How long will it take to double my money?" At 8% interest rate and continuous compounding, what is the answer? Round your answer to the hundredth's place.

5) Suppose that the function ... represents the percentage of inbound e-mail in the U.S. that is considered spam, where x is the number of years after 2000.

Carry all calculations to six decimals on each intermediate step when necessary.

a) Use this model to approximate the percentage of spam in the year 2003. Round your answer to two decimals places.

b) Use this model to determine in how many years (to two decimal places) it will take for the percent of spam to reach 95% provided that law enforcement regarding spammers does not change.