Question
Simplify the following:$\frac{(\text{a}^{3\text{n-9}})^6}{\text{a}^{2\text{n}-4}}$
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Given: line AB || line CD
Rays QX, RX, QY, RY are the bisectors of ∠AQR, ∠QRC, ∠BQR and ∠QRD respectively.
To prove: □QXRY is a rectangle.

Given: line AB || line CF and line BC || line ED
To prove: ∠ABC = ∠FDE

Given: line AB || line CD and line EF intersects them at P and Q respectively.
line EF ⊥ line AB
To prove: line EF ⊥ line CD