ok so I first tried solving for the bottom angle and I used the formula tanx=b/a
which means tanx= 7.2/14.6
that gave me x=.45
so I subtracted 45 and 90(because its right triangle) from 180 and I got 45. So maybe x=45 degrees but Im not to sure.
I think Cphill is right except the part where he says its a 12-5-17 triangle. If you use the pythagoreom theorem then z= 13
so dx/dt=39/41
