What is 2 3/7 X78.???

Which of these choices show a pair of equivalent expressions?

For the equations below which statement is true ? -2x=14 6x=-42

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?