If Z is the standard normal variable, then what is P(-4< Z < 2.1)?

Which is f(5) for the function –2x2 + 2x - 3?

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

Kayaks rent for $35 per day. which expression can you use to find the cost in dollars of renting 3 kayaks for a day?