Suppose we have relation r(a, b,c, d,e), with some set of fd'sand we wish to project those fd's onto relation s(a, b,c). give thefd's that hold in s if the fd's for r are:
a)ab--> de, c--> e, d--> c, and e--> a
b)a--> d, bd--> e, ac--> e and de--> b
c)ab--> d, ac--> e, bc--> d, d--> a and e--> b
d) a--> b , b--> c, c--> d, d--> e and e--> a

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Which law requires employers to provide safe working environments for their employees? a. civil rights act b. fair labor standards act c. occupational safety and health act d. wagner act

When early motion pictures played in movie theaters, they were often accompanied by live organ or piano music. which of the following are the most likely reasons that this happened? (select all that apply). the music was provided to distract audience members from the loud sounds made when filmstrips were changed. the music accompanied the movies because the movies were silent and audiences were used to hearing music during plays in theaters. the music usually was played before, and sometimes after the movie, as an alternative form of entertainment. the music viewers to interpret the dramatic action in the films.