Find the term that must be added to the equation x2−10x=1 to make it into a perfect square

Which of the choices shown could be used to prove that aacp=abcp ?

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.

Six random samples were taken each year for three years. the table shows the inferred population for each type of fish for each year.