I don’t know how to do it please help

Step-by-step explanation:

First you have to realize that these are similar triangles.

You can do a easy cross multiplication with these types of questions.

put the smaller above the decimal and the bigger one below like this.

=

Now cross multiply

8x=300

x=37.5

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

angle addition postulate

2x=56

step-by-step explanation: