..i don't need to turn this in rn but i have a test on this tomorrow- can someone PLSPLS explain how to do at least some of these because im hella confused and i might fail my test :(( im already failing so please help omg

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 inverse of the function f(x) = 2x + 1?

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2