Given the points (1,6) and (8, -3), find the horizontal distance between the points

Write a corresponding real world problem to represent 2x - 125=400

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

In the diagram of circle o, what is the measure of zabc?