An arc subtends a central angle measuring \dfrac{2\pi}{3}
3
2π

start fraction, 2, pi, divided by, 3, end fraction radians.
What fraction of the circumference is this arc?

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18

the answer is 15.50 for one mile

b) is slope: 0   y- intercept 15.5