Discover Questions

The sum of two numbers is 20 and their difference is 6 what are the two new numbers? What is ten and one half minus eight and five eighths? What are some differences and similaraties between a geyser and a glacier? What factors determine the stength of the friction force when two surfaces slide agaisnt each other? How do I answer this math problem? 300mi/20sec = ?mi/1 minute Thanks!?