Systems are collections of objects. Objects can be treated as if they have no internal structure. You can treat a system as an object if the internal structure is not relevant to the question. Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate or volunteer today! Donate here: https://www.khanacademy.org/donate Volunteer here: https://www.khanacademy.org/contribute ... https://www.youtube.com/watch?v=WLoBo-enxAw Note: All Khan Academy content is available for free at (www.khanacademy.org)

Practice carrying digits to add multiple digit numbers ... https://www.youtube.com/watch?v=e_SpXIw_Qts Note: All Khan Academy content is available for free at (www.khanacademy.org)

2 examples of finding the maximum and minimum points on an interval. ... https://www.youtube.com/watch?v=gzmSKrwiG3g Note: All Khan Academy content is available for free at (www.khanacademy.org)

A former high school teacher for 10 years in Kalamazoo, Michigan, Jeff taught Algebra 1, Geometry, Algebra 2, Introductory Statistics, and AP Statistics. Today Jeff is Khan AcademyÕs math content creator. He is hard at work creating new exercises and articles for AP Statistics (thank you, Jeff!). View more lessons or practice this subject at http://www.khanacademy.org/math/ap-statistics/analyzing-categorical-ap/introduction-data/v/meet-jeff-a-creator-of-ap-statistics-on-khan-academy?utm_source=youtube&utm_medium=desc&utm_campaign=apstatistics AP Statistics on Khan Academy: Meet one of our writers for AP¨_ Statistics, Jeff. A former high school teacher for 10 years in Kalamazoo, Michigan, Jeff taught Algebra 1, Geometry, Algebra 2, Introductory Statistics, and AP¨_ Statistics. Today he's hard at work creating new exercises and articles for AP¨_ Statistics. Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate or volunteer today! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc ... https://www.youtube.com/watch?v=BW01z2hmBMY Note: All Khan Academy content is available for free at (www.khanacademy.org)