Acountry's population in 1990 was 123 million. in 2002 it was 128 million. estimate the population in 2013 using the exponential growth formula.(p=ae^kt).round to the nearest millionth..

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling