Mathematics, 23.05.2020 18:01 Madeline6117
In the system 4x + 9y = 7 and and 4x - 9y = 9, would I add or subtract this system to solve for x? To solve for y?
add to solve for x or add to solve for y
subtract to solve for x or subtract to solve for y
add to solve for x and subtract to solve for y
subtract to solve for x and add to solve for y
Answers: 2
Mathematics, 21.06.2019 18:20
What is the solution set of the quadratic inequality x^2-5< or equal to 0
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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.
Answers: 3
In the system 4x + 9y = 7 and and 4x - 9y = 9, would I add or subtract this system to solve for x? T...
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