Three boxes are stacked one on top of the other. One box is 4 feet 11 inches tall, one is 6 feet 10 inches tall, and one is 2 feet 9 inches tall. How high is the stack? Write your answer in feet and inches. Use a number less than 12 for inches.

Pranza plotted point a in the coordinate plane below.

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

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?