Answer:
f = 7
Step-by-step explanation:
7f = 49
Divide each side by 7
f = 7
So you can set up proportion.

Here, you need to solve for C.
You can do that by multiple both sides by 360 and then you should get

Hope this helps.
Answer:
1. x=40
2. x=17
3. x=5
4. x=83
Step-by-step explanation:
Vector

.

. So the sum is

.
For the second, the magnitude is the square root of the sum of the squares of the components. This is equal to

.