Step-by-step explanation:
I can't see good the picture
The difference between your speed is 6 miles per hour: that means that every hour you move 6 miles relative to your friend. But you only need to catch up 3 miles: half of it. So you'll catch up after 30 minutes.
Answer:
f(-2) = 13
g(4) = -9
Explanation:
Whenever a question is asking you to find something like, in this example, f(-2) or g(4), you have to substitute whatever number is in the parentheses for every x in the function with that letter.
Let's try to find f(-2). We have to substitute -2 for every x in the function f and simplify:

Therefore,
.
Next, let's try to find g(4). We have to substitute 4 for every x in the function g and simplify:

Therefore, 
Answer:
124°+95°+124°+54°+R = 180°
R = 143°