Can anyone please help me solve these? Please, please, please For questions 1 - 5, use the following functions:

f(x) = 3x - 7
g(x) = x² + 3x-4

1. Find (f+9)(x).
2. Find (f-9)(x).
3. Find (f. g)(x).
4. Find (f/g)(x)
5. Find (g/f)(x)

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

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

Once george got to know adam, they found that they really liked each other. this is an example of what factor in friendship