30 points PLEASE HELP
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Mathematics, 21.06.2019 14:30
The circumference of a circle is 5 pi cm. what is the area of the circle?
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Mathematics, 21.06.2019 19:40
Which system of linear inequalities is represented by the graph?
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Mathematics, 21.06.2019 19:40
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.
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Mathematics, 21.06.2019 22:30
Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.
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