Prove that the segments joining the midpoint of consecutive sides of an isosceles trapezoid form a rhombus.<br />
Find the slope of DE and FG.

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?