19. you roll two standard number cubes. what is the probability that the sum is odd, given than one of the number cubes shows a 1? show your work.

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.

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years