Answer:

Step-by-step explanation:
Point B partitions AC in a 3:4 ratio.
B is located at (4,1) and C is located at (12,5).
Let
be the coordinates of A.
Then 
But m:n=3:4 implies m=3 and n=4 and 






Step-by-step explanation:
The answer for third is D, you have multiple choice in fourth which I can't see at all...
It would surely be helpful if you let us know which angles to measure!
Answer:
24.495 if they want it as a radical, it would be positive or negative radical 600.
Step-by-step explanation: