2 A population of 5000 doubles in size every year for 10 years. Which equation relates the size of the
population y to the number of 10-year periods in x?
[A) y = 2-5000 [B] y = 5000-2 [C] y = 10-2 [D] y = 5000-10 [E] y = 2-10

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