Oil and gas production in a certain area dropped from 4 million barrels in 2000 to 1.9 million barrels in 2013. Assuming that the oil and gas production decreased at a constant rate, which of the following linear functions f best models the production, in millions of barrels, t years after the year 2000?

Population of Greenleaf, Idaho The table above shows the population of Greenleaf, Idaho, for the years 2000 and 2010. If the relationship between population and year is linear, which of the following functions P models the population of Greenleaf t years after 2000?

An environmental agency is working to reduce the amount of plastic that a community discards in the ocean. Currently, the community discards 6.2 milllion pounds of plastic annually, and the agency's goal is to eliminate that amount by collecting and recycling the plastic. If the agency incrases its collection and recycling capacity at a constant rate, and meets its goal at the end of the eight year, which of the following linear functions, f, could the agency use to model the amount of plastic being added to the ocean t years into the program ?

A marketing team conducted a study on the use of smartphones. In a certain metropolitan area, there were 1.6 million smartphone users at the end of 2018. The marketing team predicted that the number of smartphone users would increase by 35 percent each year beginning in 2019. If y represents the number of smartphone users in this metropolitan area after x years, then which of the following equations best models the number of smartphone users in this area over time ?