I am not looking this up on the internet
I need actual help

What is always true about a positive integer raised to a negative odd power?

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a, b and c integers and a> 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?