Goran, a college freshman, is deciding on classes for his first term. He can choose to take some or all of the seven classes from the list below. He must take at least one of them.
Astronomy, Biology, Chemistry, Dance, Economics, Geography, History
In how many different ways can Goran choose the classes to take? (The order of the classes chosen doesn't matter.)

Which situation could best be represented by this linear equation? 24x + 38y = 520 > if x represents the number of bracelets and y represents the number of rings, there were 24 more bracelets sold than rings. the total sales were $520. if x represents the number of bracelets and y represents the number of rings, there were 38 more bracelets sold than rings. the total sales were $520. if x represents the number of bracelets sold at $24 each and y represents the number of rings sold at $38 each, the total sales were $520 if x represents the number of bracelets and y represents the number of rings, there were 520 bracelets and rings sold. bracelets were $24, and rings were $38. e