The price of gasoline varies directly with the number of gasoline purchased purchase 15 gallons of gasoline you pay $36.75

Can someone me and do the problem plz so i can understand it more better

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.

Which of the following circles have their centers in the third quadrant?