Answer:
80/160
Step-by-step explanation:
so basically...
50 is half of 100
so then you look at it and your like welp if its half then ur going to have to do half for 80
so 80 x 2= 160
and for A can you please show the options or at least tell me
Assignment: 
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Answer: 
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Explanation: 
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Note: 
[ Step One ] Multiply Both Sides By 9

[ Step Two ] Simplify

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B, Because to be a parallelogram it has to have two sides that are both parallel and congruent