2 shapes A and B, are similar. length of edges in A : length of edges in B = 2.5
The perimeter of A is 210mm
work out the perimeter of B

Find x to the nearest hundredth place

In the 30-60-90 triangle below side s has a length of and side r has a length

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.