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What are the soultion(s) to the quadratic equation 40- x^2=0

Atemperature of 1.64◦f corresponds to answer in units of ◦c.

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.