Find midpoint of the line segment in the graph

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

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585

The actual length of side t is 0.045cm. use the scale drawing to find the actual side length of w