Which of the following is equal to (2x/5-9 )+9a.2x/5b.5x/2c.2x-45/5d. (2x-9)+45

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

Solve the equation by completing the square. x^2+2x=17

What is the slope of (0,32) and (100,212)