A right triangle is formed by joining three squares at their vertices.

Which equation can be used to find the length
of x?

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

X+ y = 5 ; x - y =3 solve using linear combination

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.