Sorry I'm in high school.. but according to my physics class, the instantaneous speed is when t (time) is 0, or whatever you'd use (like x).. anyways, when t=0, the instantaneous speed would be 3 ft/s, and the instantaneous acceleration is 0.
1/3x + y = 4....subtract 1/3x from both sides
y = -1/3x + 4 <===
3*-3^2+5*-3-14
3*-9+(-15)-14
-27+-15-14
-42-14
-56
