Aplane is flying parallel to the ground along ‾
→ac .
when the plane is at a, an air-traffic controller in
tower t measures the angle to the plane as 40°. after
the plane has traveled 2.4 miles to b, the angle to the
plane is 80°. how can you find bt?

(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

d is correct

step-by-step explanation: