What is the rest of the question?
-7z^7(-19z^7) = (-7 x -19) x z^(7 + 7) = 133z^14
Since C is 61 degrees, A is 90 degrees because of the right angle, and B would be 29 degrees because you add 61 and 90 together and subtract that amount from 180.
Wait I'm sorry if this is what you aren't looking for-
You need to know the equation of motion for the particle.
