A, B&C form a triangle where BAC= 90 degrees. AB=10.8mm and CA=1.6mm.
Find the length of BC, give your answer rounded to 1DP

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.

100 points? me its important ‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️

At your job you're paid $50 per week plus $3 per sale at least how many saled do you need to make in order to have over $250