Factor the polynomial 21y^5 − 14y^3 − 3y^2 + 2 completely.

Nine more than four times a number is the same as one less than twice the number. find the number?

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

Charlie tosses five coins.what is the probability that all five coins will land tails up.