A ) P=6n+18 where N is the number of triangles. There's always two '9's and the 6 is based on how many triangles there are.
First, you will have to convert both the fractions to improper fractions, then you will multiply both the fractions. Once you are done multiplying it you will convert them to mixed fractions.
307,495 rounded to the nearest thousand is 307,000
Hope I helped
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