What is the percent of discount if the cost is 2.50 and the selling price is 3.50?

Which two undefined geometric terms always describe figures with no beginning or end?

What is the best estimate of the length of a football

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30