Which two segments have the same length

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

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)