Help me please Algebra 2

To determine the number of deer in a forest a forest ranger tags 280 and releases them back

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?

What is the absolute value of -100000000000000?