Does anybody know linear regression

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.

Gh bisects fgi. find the measure of hgi •15° •21° •10° •8°

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.