A wiring job calls for thirty two pieces of 1/2 inch conduit 7 1/2 feet long, eight pieces 13 1/4 inches long, three pieces 7 3/4 inches long, and six pieces 9 5/8 inches long. What is the total number of feet of 1/2 inch conduit re quiered for the job?

A seamstress needs to cover a box that is 10 cm long 6 cm high and 4 cm wide with material on al the sides. Hcw much naterial does she need?

i need assistance finding the dimensions on part C. Thank you!

A 10cm diameter disk emits light uniformly from its surface. 20 cm from this disk, along its axis, is a 7.0cm diameter opaque black disk; the faces of the two disks are parallel. 20 cm beyond the black disk is a white viewing screen. The lighted disk illuminates the screen, but there’s a shadow in the center due to the black disk. What is the diameter of the completely dark part of this shadow?