The population of a particular country was 26 million in 1981; in 1990, it was 31 million. the exponential growth function describes the population of this country t years after 1981. use the fact that 9 years after 1981 the population increased by 5 million to find k to three decimal places.

Technicians have installed a center pivot, circular irrigator for a farm that covers 25 acres. a.) how long is the irrigation boom (in feet) from the center pivot to its farthest extent? b.) if the irrigation boom makes 4 full revolutions in a day, how many miles does the end of the boom travel in 5 days?