19.) The football coach randomly selected ten players and timed how long each player took to perform a certain drill. The times in minutes) were:
957 12 14
14 5 11 69
Find a 95% confidence interval for the population standard deviation .

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.

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.

Find the slope of the line that passes through the points (-2, 4) and (-5, -6). -2/7 10/3 -2/3