Solve the riddle for points and crown

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

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

Select the number of ways in which a line and a circle can intersect