26 Published September 1, 2012 at 3264 × 2446 in 8/26 – 8/30/13 (Chap 1-2) The “trio” derivative (slope graph of x vs. t, in other words dx/dt) and second derivative (slope of the slope graph of x vs. t . . . or . . . dv/dt . . . or d²x/dt²)