Determine the domain of the function: a. {x | x ≠ 0} b. {x | y ≠ 0} c. {x | x = r} d. {x | x = ∞}

Principle: The domain of a function is all the possible x-coordinates.

Here, x can be all real numbers except 0, so the answer is A.

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.

not sure but it may be b, as i said i'm not sure.