Which theorem or postulate justifies this statement? angle6 cong angle13 A. vertical angles theorem

B. alternate interior angles theorem

C. alternate exterior angles theorem

D. corresponding angles postulate

E. linear pair postulate

Which sum or difference identity would you use to verify that cos (180° - ∅) = -cos ∅? a. sin (α -β) = sin α cos β – cos α sin β b. cos (α -β) = cos α cos β – sin α sin β c. cos (α -β) = cos α cos β + sin α sin β d. sin (α + β) = sin α cos β + cos α sin β

What is the y intercept of f(x)=(1/2)^x?

Given: pqrs is a parallelogram prove: pr and qs bisect each other at t