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- If a pond lily doubles everyday and it takes 30 days to completely cover a pond, on what day will the pond be 1/4 covered?

- day 4
- day 8
- day 15
- day 20
- day 28

- If a pond lily doubles everyday and it takes 30 days to completely cover a
pond, on what day will the pond be 1/2 covered?

- day 15
- day 20
- day 25
- day 28
- day 29

- The amount of lillies produced between day 29 and day 30 is

- equal to the entire amount of lillies produced previously
- is twice as large as that produced between day 14 and day 15
- about the same as produced between day 28 and day 29
- the same as between any 2 days since the growth rate is
constant

- What is the doubling time of the entire lily pond?

- 1 day
- 2 days
- 10 days
- 20 days
- 30 days

- A different lilly pond has more nutrients and has a pond doubling
time of 16 days. On approximately what day is 10% of the pond covered?

- day 1
- day 2
- day 5
- day 9
- day 13

- The current population of Eugene is 140,000 people. If the population
growth rate remains at 4% per year, approximately when will the city
of Eugene have 500,000 people?

- the year 2010
- the year 2022
- the year 2035
- the year 2050
- the year 2095

- Resource X is currently being used at the rate of 100 units per year.
The current growth rate is 10%. This growth rate is expected to remain
this way for the next 14 years. In year 15 and beyond, the growth rate
will reduce from 10% to 5%. In 28 years, what will be the usage rate
of resource X?

- 200 units per year
- 400 units per year
- 800 units per year
- 1600 units per year
- 3200 units per year