You have uploaded question 19 please upload 20 as well I am confused with it. Please try to asap.

19. Draw the following ternary relationship: Labs are assigned techs and instruments. When a tech is assigned to a lab, he/she is also assigned an instrument for that rotation. Techs are rotated through the various labs. Instruments are taken offline sometimes for service. Labs are sometimes closed for cleaning. A lab is staffed by at least 1 tech. An instrument can be assigned to different labs over its life span. 20. Convert this to an EERD with an associate entity. You must include the correct optionality and cardinality conversions. 19. Draw the following ternary relationship: Labs are assigned techs and instruments. When a tech is assigned to a lab, he/she is also assigned an instrument for that rotation. Techs are rotated through the various labs. Instruments are taken offline sometimes for service. Labs are sometimes closed for cleaning. A lab is staffed by at least 1 tech. An instrument can be assigned to different labs over its life span. 20. Convert this to an EERD with an associate entity. You must include the correct optionality and cardinality conversions