What is the sum of 8.7 + 5.22=

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 not true about kl and mn? what is mn? (show your work)

Will give brainliest immeadeately true or false: the origin woud be included in the solution set for the inequality: y< 2x-5