How can positive feedback influence the behavior of a system? A. It can cause the system to maintain a constant output.
B. It can cause the system to decrease its input more and more.
C. It can cause the system to increase its output more and more.
D. It can cause the system to more efficiently convert inputs into
outputs.

i know it might be a bit late but for the people who also need this. The answer is C. It can cause the system to increase its output more and more.

Explanation: I took the test on A P E X

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west