Answer:
x3-6x2+32
Step-by-step explanation:
Your answer is
x^ 3 -6
x^ 3- 6
cubed x first. then subtract 6 from that
6.83333333333 (repeated)
1/3 x 20.5= 6.83333333333...
it would be 17 if you round the answer or 17.69.
So he rode 
miles, or if they want it as a fraction, it would be 