What are the solutions to these graphed systems of equations?

For which pair of functions is (gof)(a)=|a|-2?

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

What is the unit rate of, 75% high fiber chimp food to 25% high protein chimp food.