A bacteria culture doubles every 15 days. If the initial population of the bacteria was 25, what is population after 60 days?

A fish population starts at 15000. The (annual) birth rate is 0.4; the (annual) death rate is 0.3. In addition, 1500 fish are stocked each year, and 2000 are caught and removed from the population each year. Determine the size of the population after 1 year and 2 years Answer to the nearest 1.

Greg and Martin's age when added together come to a total of 60 years. Now Greg is twice as old as Martin was when Greg was half as old as Martin will be when Martin is five times as old as Greg was when Greg was five times as old as Martin. With all this excellent data how old is Greg?

The halflife of Radium-226 is 1590 years. If a sample contains 500 mg, how many mg will remain after 3000 years ?

A common inhabitant of human intestines is the bacterium Escherichia coli. A cell of this bacterium in a nutrient-broth medium divides into two cells every 20 minutes. The initial population of a culture is 60 cells.

The population of Mickey Village is 48,000 today.  Every other year the population increases by 1,550 people.  In approximately how many years will the population exceed 70,000 people?