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What is the volume of a rectangular prism if the length is 10.4 mm the width is 5 mm in the height is 8 mm

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?

If you have 12 feet of string and you cut it into equal length of 5 inches each how much string will be left