What expression is best : a machine paints 340 toy boats in 45 mins. which expression equals the unit rate per hr
a. 3/4 over 340 b. 340/3 c.45/340 d. 340/45

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?