Ken used a piece of lumber to build a bookshelf. if he made three shelves that are each 2 1/2 ft long, how long was the piece of lumber?

Your friend swims on the school team. in his first four races, his times are 24.7, 23.5, 25.6, and 27.2 seconds. which time listed for his next race would make the range larger?

The random variable x represents the number of phone calls an author receives in a day, and it has a poisson distribution with a mean of 8.7 calls. what are the possible values of x

Solve the formula ax+ by = c for x.