Answer:
Divide: 7/12 : 3/10 = 7/12 · 10/3= 7 · 10 /12 · 3 = 70/36 = 35/18
To divide one fraction by another, invert (turn upside-down) the second fraction, then multiply.
Hope this helps:)sorry if it doesnt
Answer: 
<u>Add 3x to both sides</u>
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<u>Subtract 15 from both sides</u>
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<u>Divide both sides by 5</u>
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I can’t answer it without a picture of the graph
32 sides of a polygon has 20 triangles.