What is the ratio of the sides of a triangle that is 21: 8: 14 if the perimeter is 215 feet

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

What properties allow transformation to be used as a problem solving tool

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