# gr9math

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**gr9math**

how many sides does a polygon have if the sum of its interior angles are a) 1080 b) 1260 How could i figure this out without being able to know how many sides the polygon has?

**gr9math**

about 99% of the mass of the human body is made up of just six elements. oxygen:65% carbon18% hydrogen:10% calcium:1.5% phosphorus:1.0% Find the mass of each element in a human body iwth mass 60kg. could you please explain to me how to do this? your help is appreciated.:)

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