Solve the system of equations by substitution. -3.x + 5y =-11

y=-1

A) (4.4)
B) (-4,-4)
C) (-4,-1)
D) (2, -1)

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?