How many commuters must be randomly selected to estimate the mean driving time of chicago commuters? we want 95% confidence that the sample mean is within 3 minutes of the population mean, and the population standard deviation is known to be 12 minutes.

Classify the polygon by its number of sides. state whether the polygon appears to be regular or not regular. a.heptagon, regular b. heptagon, not regular c. octagon, regular d. octagon, not regular

In trapezoid efgh, m∠gfe=63∘. identify m∠ghe. !

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters