Alg 2 Unit 4A Exponential Functions

A bacteria population is growing exponentially with a growth factor of 3/7 each hour. By what factor does the population change each half hour?

A sample of radium has a weight of 6.25 mg and a half-life of approximately 14 years. Find a function 𝑓 which models the amount of radium 𝑓(𝑡), in mg, remaining after 𝑡 years.

Scientists measure a bacteria population and find that it is 50,000. Seven days later, they find that the population has doubled. Write a function 𝑓 that could describe the bacteria population 𝑑 days after the scientists first measured it, assuming it grows exponentially?

• about 0.6626

• about 0.8718

• about 0.0014

• about 0.76

• about 0.6626

• about 0.8718

• about 0.0014

• about 0.76

• about 0.6626

• about 0.8718

• about 0.0014

• about 0.76

• about 497.8 mg

• about 485.2 mg

• about 473.3 mg

• about 18.57 mg

• about 7.8 mg

• about 85.2 mg

• about 473.3 mg

• about 18.57 mg

• Bloom A

• Bloom B

• Bloom C

• They're all the same size.

• Bloom A

• Bloom B

• Bloom C

• They're all increasing the same amount.