In kick boxing, the force needed to break a board varies inversely with the length of the
board. If it takes 5 pounds of pressure to
break a board 2 feet long, how many
pounds of pressure will it take to break a
board that is 8 feet long?

What's the difference between: x≥0 and nonnegative integer. ?

Me n o w. i need t h i s. 10 points

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?