The variable in an algebraic expression is represented by a letter and can vary (change). Example: "x" in "3x + 5" A constant in an expression does not change even if the variable does. Example: "15" in "x + 15"

In the expression below, identify the variable and the constant:

5z - 20

point raid

Step-by-step explanation:

point raid

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.