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List of temperature in Memphis, Tennessee summer 1980? I want to login again? How do i confirmed the identity of a person saw over the internet? If the fifth term of a geometric sequence is 81 and the common ratio is 3/4, find the sum of the first 20 terms? If a and b are positive integers such that gcd(a,b)=210, lcm[a,b]=210^3, and a** **