21 Questions
| Attempts: 100

Questions and Answers

- 1.The mad cow virus is attacking a mob of 10,000 cattle, spreading through the healthy mob at the rate of 4% per day (r=0.96). At the start of which day will the mob have at least 500 infected cattle? (Number only)
- 2.An interest bearing bank account starts with an investment of $5000 in 2010, and grows with an interest rate of 5% per annum (r=1.05). By the start of which year will the total investment including the principal first exceed $6000.
- 3.An interest bearing bank account starts with an investment of $5000 in 2010, and grows with an interest rate of 5% per annum (r=1.05). By the start of which year will the total investment including the principal first exceed $7000.
- 4.An interest bearing bank account starts with an investment of $5000 in 2010, and grows with an interest rate of 5% per annum (r=1.05). By the start of which year will the total investment including the principal first exceed $8000.
- 5.An interest bearing bank account starts with an investment of $5000 in 2010, and grows with an interest rate of 5% per annum (r=1.05). By the start of which year will the total investment including the principal first exceed $9000.
- 6.An interest bearing bank account starts with an investment of $5000 in 2010, and grows with an interest rate of 5% per annum (r=1.05). By the start of which year will the total investment including the principal first exceed $10000.
- 7.A 20,000 tank on an outback farm is full to the brim with water. Its a big one. During the dry season, the owners use 0.3% (r=0.97) of the remaining volume in the tank around the house each day, hoping to see out the dry spell and into the wet season. At the start of which day will the tank first have less than 19000 litres? (just type the number of the day ... ie Day 17 = 17)
- 8.The mad cow virus is attacking a mob of 10,000 cattle, spreading through the healthy mob at the rate of 4% per day (r=0.96). At the start of which day will the mob have at least half the mob infected? (Number only)
- 9.A 20,000 tank on an outback farm is full to the brim with water. Its a big one. During the dry season, the owners use 0.3% (r=0.97) of the remaining volume in the tank around the house each day, hoping to see out the dry spell and into the wet season. At the start of which day will the tank first have less than 17000 litres? (just type the number of the day ... ie Day 17 = 17)
- 10.A 20,000 tank on an outback farm is full to the brim with water. Its a big one. During the dry season, the owners use 0.3% (r=0.97) of the remaining volume in the tank around the house each day, hoping to see out the dry spell and into the wet season. At the start of which day will the tank first have less than 16000 litres? (just type the number of the day ... ie Day 17 = 17)
- 11.A 20,000 tank on an outback farm is full to the brim with water. Its a big one. During the dry season, the owners use 0.3% (r=0.97) of the remaining volume in the tank around the house each day, hoping to see out the dry spell and into the wet season. At the start of which day will the tank first have less than 18000 litres? (just type the number of the day ... ie Day 17 = 17)
- 12.A blue green algae outbreak has been noticed on a lake. When first discovered (Start of Day 1), it was covering only 10 square metres, but by the start of the second day, this had increased to 15 square metres and on day three it is 22.5 square metres. At the start of which day will the lake have over 50 square metres of algae?
- 13.A 20,000 tank on an outback farm is full to the brim with water. Its a big one. During the dry season, the owners use 0.3% (r=0.97) of the remaining volume in the tank around the house each day, hoping to see out the dry spell and into the wet season. At the start of which day will the tank first have less than half its full capacity? (just type the number of the day ... ie Day 17 = 17)
- 14.The mad cow virus is attacking a mob of 10,000 cattle, spreading through the healthy mob at the rate of 4% per day (r=0.96). At the start of which day will the mob have at least 3000 infected cattle? (Number only)
- 15.The mad cow virus is attacking a mob of 10,000 cattle, spreading through the healthy mob at the rate of 4% per day (r=0.96). At the start of which day will the mob have at least 2000 infected cattle? (Number only)
- 16.The mad cow virus is attacking a mob of 10,000 cattle, spreading through the healthy mob at the rate of 4% per day (r=0.96). At the start of which day will the mob have at least 4000 infected cattle? (Number only)
- 17.The mad cow virus is attacking a mob of 10,000 cattle, spreading through the healthy mob at the rate of 4% per day (r=0.96). At the start of which day will the mob have at least 1000 infected cattle? (Number only)
- 18.A blue green algae outbreak has been noticed on a lake. When first discovered (Start of Day 1), it was covering only 10 square metres, but by the start of the second day, this had increased to 15 square metres and on day three it is 22.5 square metres. At the start of which day will the lake have over 300 square metres of algae?
- 19.A blue green algae outbreak has been noticed on a lake. When first discovered (Start of Day 1), it was covering only 10 square metres, but by the start of the second day, this had increased to 15 square metres and on day three it is 22.5 square metres. At the start of which day will the lake have over 200 square metres of algae?
- 20.A blue green algae outbreak has been noticed on a lake. When first discovered (Start of Day 1), it was covering only 10 square metres, but by the start of the second day, this had increased to 15 square metres and on day three it is 22.5 square metres. At the start of which day will the lake have over 100 square metres of algae?
- 21.A blue green algae outbreak has been noticed on a lake. When first discovered (Start of Day 1), it was covering only 10 square metres, but by the start of the second day, this had increased to 15 square metres and on day three it is 22.5 square metres. At the start of which day will the lake have over 75 square metres of algae?

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