Maria works for an online auto trader. She makes a piecewise function to show the cost to place an online advertisement. c(x)39 when x ≤ 6 39 + 5(x − 6) when x > 6 What is the cusp of the function?

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?