A diner serves breakfast, lunch, and dinner. Some of the breakfast items have egg. Some of the non-breakfast items also have egg. Let B be the set of items available at breakfast and E be the set of items that contain egg. What does P(B∪E)=13 mean?

What is the compound interest in a three-year, $100,000 loan at a 10 percent annual interest rate a) 10.00 b) 21.00 c) 33.10 d) 46.41

The length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?  

Me because i don't understand how to do it.: )