Arandom sample of 105 light bulbs had a mean life of 441 hours with a standard deviation of 40 hours. construct a 90% confidence interval for the mean life, mu, of all light bulbs of this type.

What is the solution to the system of the equations? x = y - 3 x + 3y = 13

Ac contractor is building a new subdivision outside of the city. he has started work on the first street and is planning on the other streets to run in a direction parallel to the first. the second street will pass through (-2,4) find the equation of the location of the second street in standard form. a.2x+y=2 b. x-y=2 c.2x+y=2 d.x+y=2

7. the area of the playing surface at the olympic stadium in beijing isof a hectare. what area will it occupy on a plan drawn to a scaleof 1: 500?