Is the following definition reversible? is yes write it as a true biconditional. think whether the angles have to be touching

linear pairs of angles are supplementary

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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?