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(Intersection) Express R ∩ S in terms of differences. 7.
(Closure) Let R be a relation and let X = {A1, A2, ... , Ak } be a subset of the attributes of R. Define X+, the closure of X, as the smallest set X+ such that X+ ⊃ X and X+ → B implies B ∈ X+.
(a) Find the closure of the set {Instructor, Grade} in School.
(b) Show that X is a super key if and only if X+ is the set of all attributes of R. Hint! For "if " construct X+ step by step.
the circle is circumscribed by the pentagon as shown (not drawn to scale). If QZ=10, YX=9, XW=9, UW=17, and SU=10, find the perimeter of the pentagon.
Calculate probabilites of gettin from 0 to 5 clubs on a hand. What is the probabilty of gettin 2 or fewer cubs of 5 cards?
Boris races his bicycle for 264 feet . A wheel of his bicycle turns 44 times as the bicycle travels this distance. What is the diameter of the wheel?
A horizontal rectangular fish tank with a base 2ft x 4ft and 2ft height is filled within 2in of the top. Find the fluid force against each side and against the end of the tank.
The length of the red line segment is 18, and the length of the blue line segment is 8. How long is the transverse axis?
Find the marginal product equations for the following production functions:
At what rate is the base of the triangle changing when the altitude is 11.5 centimeters and the area is 86 square centimeters?
Let v(t)=3t^2-12t be the velocity of a particle moving along the x-axis for time t, t>(less than or equal to)0 When t=0 the particle is at x=-6.
A jar contains red and white marble. The number of white marbles is 5 more then twice the number of red marbles. If the probability of drawing a red marble a random is 2/7,
researchers develop a model to predict the age ynbsp of the individual based on the gender of the individual x1 0female
Discuss issues involved in developing successful spam filters and the current situation in the war between spammers and people trying to filter spam out.
the intensity of light from a light bulb, measure in watts (w), varies inversely as the square of the distance (d) from the light bulb. Suppose I is45 w/m(squared) when the distance is 6m.
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