A student had $40 but spent $32. What percentage of his money has he spent?​

80%

Step-by-step explanation:

$40->100%

$32->x

x=32×100/40

x=80%

the correct answer is 80%

20

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