1) Circle the equation that is NOT an example of direct variation.
A) y= 3 X+1
B)y= 16x
C) y = 4x
D) y=-9x

A) y= 3 X+1  

Step-by-step explanation:

A direct variation is of the form

y = kx

A) y= 3 X+1   not a direct variation since we add 1 to it

B)y= 16x  direct variation

C) y = 4x  direct variation

D) y=-9x direct variation

(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

this answer is !