The population of a community is known to increase at a rate proportional to the number of people present at time t (in years). In 4 years, the population has increased to 4,000 from an initial population of 2,000. What is the formula for the population P(t) at time t?

What is the shape of the height and weight distribution

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?

Gravel is being dumped from a conveyor belt at a rate of 25 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. how fast is the height of the pile increasing when the pile is 14 ft high? (round your answer to two decimal places.) ft/min