Please answer I need help!

How to determine whether two known pairs of points are on the same line.

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

Divide the following fractions 3/4 ÷ 2/3 1/2 8/9 9/8 2