Honors M3T2 Test Review

Which function models exponential decay?

• Bill saves $200 in a box under his bed

• The y-intercept of the function is (0, 200)

• Bill deposited $200 into the savings account

A scientist is running experiments with a particular strain of bacteria. He puts a tiny sample of 70 bacteria in cold storage, which prevents the bacteria from reproducing. However, the sample becomes contaminated with a single cold-resistant bacterium of a different strain, which begins reproducing. The cold tolerant bacteria triples in number every hour. Select the equation that models the number of bacteria in the sample over time.

• 135

• 985

• 8865

• 9000

• 20%

• 15%

• 12%

• 2%

Does the following table represent an exponential function?

• Yes, exponential

• No, linear

• No, other function

Last year, the population of a small community was 28,000. This year, this population decreased to 26,880. It is expected that each year, this population will continue to decrease exponentially. Which equation best models the expected population for this community beginning last year as time goes on?

• The y-intercept is 8000

• The function shoes an investment that increases exponentially

• The interest rate is 2.5% each year

• The investment doubles every 2.5 years

What is the average rate of change between t = 6 and t = 10?

• $1059.30

• $1267.23

• $2534.45

• $2782.10

A sample of Bacteria A has 2000 cells and increases at a rate of 10% per day. A sample of Bacteria B has 3000 cells and increases at a rate 100 bacteria a day.

• Bacteria A

• Bacteria B