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scientific notion

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

Someone me what is the area of this figure? 18m 18m 8m 16m

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x