LetU = {q, r, s, t, u, v, w, x, y, z} A = {q, s, u, w, y} B = {q, s, y, z} C = {v, w, x, y, z}Determine the following.(A ? B') ? (B ? A')
A. {u, w, z}
B. {u, w, y, z}
C. {q, s, y}
D. {q, s, u, w, y, z}
Answer: A
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A. 
B. 
C. 
D. 
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Solve the problem.Regrind, Inc. regrinds used typewriter platens. The cost to buy back each used platen is $2.70. The fixed cost to run the grinding machine is $380 per day. If the company sells the reground platens for $7.70, how many must be reground daily to break even? (Assume that there are no unsold platens at the end of the day.)
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Find the solutions, if any, to the system.
What will be an ideal response?