Please help me (wrong answers get reported)

What are the domain and range of the function? f(x) = -4 (sqrt)x

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?

Find two consexutive odd integers such that the sum of their square is 650