This is my sister asking for help, can you please help her? ( She don't want me to help her cause i might get it wrong ) This better not get remove

im sorry i think i got it wrong

d. there are exactly three scalene triangles.

Step-by-step explanation:

a, is incorrect because isosceles triangles has both two equal sides and two equal angles.

b, is incorrect because some of the triangles aren't ACUTE triangles...

c, is incorrect because there isn't 3 right triangles.

d, is correct because scalene triangles HAS ALL DIFFERENT SIDES AND LENGTHS

based on context clues you gave i'm assuming the answer would be c.

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