Bethany has a piece of yarn that is 27 feet, 6 inches long. she gets another piece of yarn that is 14 feet, 9 inches long. complete the equation to find out how much yarn bethany has in total. (27feet,6inches)+(14feet,9inches)= ? feet, ? inches

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

How do you use the elimination method for this question? explain, because i really want to understand!

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827