A company makes steel rods shaped like cylinders. Each rod has a diameter of 4 centimeters and a height of 90 centimeters. If the company used 30,520.8 cm of steel, how many rods did it make?
Use 3.14 for x, and do not round your answer.

26.986 rods

Step-by-step explanation:

(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