What is the value of -3 - (-10) - 8

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

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2

Plzzz answer both questions and i will give you 100 points