The cross section of a water bin is shaped like a trapezoid. The bases of the trapezoid are 13 feet and 9 feet long. It has an area of 55 square feet. What is the height of the cross section? HELP

the answer is 5 feet

Step-by-step explanation:

(13+9)/2=11

55/11=5

(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