Hello please help Ill GIVE if correct its easy math
the equation y+4x=100 represents your distance y (in meters) from the finish line x seconds after you begin your leg of a relay race. The equation y+3.8x=97 represents your opponent’s distance from the finish line. How far do you need to run until you catch up to your opponent?

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.