The low temperature was 35f. this was 13f lower than the daytime high temperature. write an equation to determine whether the high temperature was 48f or 42f

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?