Evaluate the piecewise function when x = -1.

Step-by-step explanation:

-2<-1<1, so f(-1)=-1-2=-3

13

step-by-step explanation:

distance formula is d=√(x2-x1)^2   +   (y2-y1)^2

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.