Anewly married couple bought an old house in need of repair for $35,000 .over ten years they spent $ 20,000 refurbishing the house. after living in the house for many years ,they sell the house for $65,000 .how much profit did the couple make on the a) $30,000 b)$ 45,000 c) $10,000 d) $ 15,000

Need on this one asap im almost done with this subject

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.