If you spend 9.74 in how many ways can you receive change from a $10 bill

The sum of the reciprocal of a positive number and the reciprocal of 2 more than the number is 3/4 equation: the number is

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David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.