How to solve 2x2-6+10/2= Pleasee answer this because this is super extrimely hard

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How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)

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

Which of the following statements would be sufficient to prove that parallelograms pqrs is a rectangle ?