Mathematics, 14.02.2020 23:08 sand1g67
Given two relations R1 and R2, where R1 contains N1 tuples, R2 contains N2 tuples, and N2 > N1 > 0, give the minimum and maximum possible sizes (in tuples) for the resulting relation produced by each of the following relational algebra expressions. In eachcase, state any assumptions about the schemas for R1 and R2 needed to make the expressionmeaningful:
(1) R1 U R2,
(2) R1 n R2,
(3) R1 R2,
(4) R1 x R2,
(5) (Ta=5(R1),
(6) 7T a (R1), and
(7) R1/ R2
Answers: 2
Mathematics, 21.06.2019 20:00
Ialready asked this but i never got an answer. will give a high rating and perhaps brainliest. choose the linear inequality that describes the graph. the gray area represents the shaded region. y β€ β4x β 2 y > β4x β 2 y β₯ β4x β 2 y < 4x β 2
Answers: 1
Mathematics, 21.06.2019 22:00
White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.
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Mathematics, 21.06.2019 22:30
Marquise has 200 meters of fencing to build a rectangular garden. the garden's area (in square meters) as a function of the garden's width w w (in meters) is modeled by: a ( w ) = β w 2 + 1 0 0 w a(w)=βw 2 +100w what side width will produce the maximum garden area? meters
Answers: 1
Given two relations R1 and R2, where R1 contains N1 tuples, R2 contains N2 tuples, and N2 > N1 &g...
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