ANSWER PLS PLS PLS

Solve the proportion!

To solve this, you need to isolate/get the variable "n" by itself in the equation:

   Multiply 21 on both sides to get "n" by itself

    Simplify the fraction

-18 = n

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.