How much interest is earned on $583 at 8% for six years

How to do this , and can some one explain

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

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?