A road sign casts a shadow that is 4 feet long. At the same time a 6 foot man standing next to the sign casts a shadow that is 2.4 feet long. How tall is the sign

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

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

Cody ran nine miles on his first day of training. the next day he ran 1/8 that distance. how far did he run the second day?