The rational number -5/-7 and 7/-9 lie on opposite sides of zero on the number line.​True or false​

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

Can someone me out here and the tell me the greatest common factor

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