Solve the system by the addition method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. {(5, 4)}
B. {(6, 4)}
C. no solution; ?
D. {(6, 3)}
Answer: D
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Write the indicated statement. Use De Morgan's Laws if necessary.If it is love, then it is blind.Contrapositive
A. If it is not blind, then it is not love. B. It is blind if it is love. C. If it is blind then it is not love. D. If it is blind then it is love.
Simplify, if possible.
A. -6x
B. -1
C. 
D. 1
Solve the problem.Use the formula N = Iekt, where N is the number of items in terms of the initial population I, at time t, and k is the growth constant equal to the percent of growth per unit of time. A certain radioactive isotope has a half-life of approximately 1500 years. How many years would be required for a given amount of this isotope to decay to 25% of that amount?
A. 3000 years B. 2975 years C. 623 years D. 1125 years
Use a Venn Diagram and the given information to determine the number of elements in the indicated region.n(U) = 88, n(A) = 29, n(B) = 31, n(C) = 42, n(A ? B) = 6, n(A ? C) = 6, 
and 
Find 
A. 19 B. 3 C. 2 D. 22