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Find x to the nearest hundredth place

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?