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1. Drag the red marbles into the top box (above
the fraction bar), and the blue marbles into the
bottom box (below the fraction bar).
What is the ratio of red to blue marbles? Can
the fraction representing the ratio be reduced?

1. what are the missing reasons in the proof 2. it's in the second picture and 3

Which expression is equivalent to 3^3 + 2^2?

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.