the last choice is the one you want
if you plug in the values of x to our rational function, the y values you get back match those in the last choice. the limit is -4; we see that as our x value approach 0 (but cannot equal ), the y values get closer and closer to -4. so that's the limit!
1 revolution is equivalent to the circumference of the wheel
1 revolution = πd ( d is the diameter )
= 70π cm
50 revolutions = 70π × 50 = 3500π cm = 35π m ≈ 110m ( nearest metre )