Each step is two feet long and two feet high. If Jack is standing 4 feet from the base of the stairs, determine the angle of elevation from the ground where Jack is standing to the top of the stairs. Round your answer to the nearest tenth of a degree.

Find the multiplicative inverse of 8-12i

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

Janet is rolling a number cube with the numbers one through six she record the numbers after each row if she rolls of keep 48 times how many times should she expect to roll a 4