What is 21/7 as a decimal

Find three consecutive numbers such that the sum of one-fourth the first and one-fifth the second is five less than one-seventh the third

An episode of a television show is 60 minutes long when it originally airs with commercials. on a dvd without commercials, the episode is only 417 minutes long. how many1-minute commercials did the episode include when it originally aired? write and solve an equation to justify your answer.

The perimeter of a quarter circle is 14.28 miles. what is the quarter circle's radius?