Break apart the figures into rectangles to calculate the answer!!.help

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

Use the graph of the sine function y=2sinθ shown below

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.