Find the values of x and y that make the quadrilateral a parallelogram.

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

Which point on the x-axis lies on the line that passes through point c and is parallel to lino ab?

For what values of x is x2 + 2x = 24 true?