Understanding exponential and logarithmic functions

A population of bluegill is currently estimated at 800 and is growing at a rate of 12% per year. What will the population be in 8 years?

• 1981

• 288

• 2014

• 294

An investment of $9,875 earns 4.8% interest compounded monthly over 12 years. Approximately how much INTEREST is earned on the investment?

• $7,457.95

• $10,359.57

• $17,546.55

• $484.57

The price of a motorcycle was Rs. 34,000 last year. It has increased by 20% this year. The price of motorcycle now is:

• Rs 36000

• Rs 38,800

• Rs 40,800

• Rs 32000

In 1985, there were 285 cell phone users in a small town. The number of users increased by 75% per year after 1985. Based on the data shown, which of the following is closest to the number of cell phone users in this small town in 1994?

• 400,000

• 25,000

• 40,000

• 250,000

The compact disc format has been declining in popularity, and one music executive has predicted that CD sales will decrease by 20% per year. If the executive's company started selling 3,900,000 CDs this year, how many will the company sell 4 years from now?

• y = 3, 900, 000 (0.8)^x

  $12,480, 000

• y = 3, 900, 000 (0.8)^x

  $1,597,440

• y = 3,900,000 (4)^x

  $1,597, 440

• y = 20 (4)^x

  $12, 480, 000

What is 4 x 4 x 4 x 4 x 4 as an exponent

• 5⁴

• 4⁵

• 4⁴

• 5⁴

The Daily/Quarterly/Annually compound formula is

A city's population is currently 10,000 people and is growing at 4.5% per year, how many people will there be in 5 years?

• 10,227

• 12,462

• 64,097

• 50,328,438

What is the multiplier?

• 189

• 1/3

• 3

• 1/2

The population of Winnemucca, Nevada, can be modeled by P=6191(1.04)^t where t is the number of years since 1990. What percent did the population increase each year?

• 4%
• It doesn't say
• I don't know
• 400%