Mrs. Dobbs wants to replace the grass in her backyard and needs to find the area, in square feet, so she can purchase sod. The area is composed of a triangle and rectangles as shown below.

(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

c > -10.55

step-by-step explanation: