In which of the above figures is ab = ac ?

The tangent segments to a circle from an external point are equal.

The answer for your question is {D}

You can use the attached file for your understanding and use.

true? is that what you're asking or do you mean something else?

the formula of a slope:

from a table we have

substitute:

the slope of f(x) is -1.

the graph of funcfion g(x) is a horizontal line. the slope of a horizontal line is equal 0. therefore the slope of g(x) is 0.

-1 < 0