4x + 3y = 3 2x + 9y = 7

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

The area of square garden is 300m squared. how long is the diagonal?

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.