The weight of a stack of different books be the number of books in the stack is that a relationship proportional o not

No

Step-by-step explanation:

If the books are different weights individually, then the weight isn't increasing the same amount each time a book is added, it isn't proportional :)

x=4

step-by-step explanation:

f(x) = x^3 -2x^2 -3x

x( x^2 -2x-3)

x( x^2 +x -3x -3)

x( x(x+1) -3(x+1))

x( x-3)( x+1)

so zeroes are 0, 3,-1

its (2) option