If z is the principal square root of 8, what must be true? if z is the principal square root of 8, what must be true?
a. z = 82, and z is positive
b. z = 82, and z is negative
c. z2 = 8, and z is negative
d. z2 = 8, and z is positive

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem