Solve the problem.Use a tree diagram showing all possible results when four fair coins are tossed to list the ways of getting exactly two tails.
A. hhtt, htht, htth, thht, thth, tthh
B. hhtt, htht, htth, thht, thth, tthh, ttht
C. hhtt, htht, htth, thth, tthh
D. tthh
Answer: A
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Indicate whether the ordered pair is or is not a solution to the given system.
(2, -6)
A. Solution B. Not a solution
Solve the equation.|2x2 - x - 1|= 3
A. 
B. no solution
C. 
D. 
Solve the problem.Calculate the coordinates of the new location of the point (14, 0) when it is rotated 30° counterclockwise about the origin. Remember that it is the matrix 
that rotates a point 30° counterclockwise about the origin.
A. 
B. 
C. 
D. 
Provide an appropriate response.Suppose that A is an m × n matrix and B is a p × q matrix. Under what conditions will the sum A + B exist?
A. The sum will exist if m = p and n = q. B. It is not possible for the sum to exist. C. The sum will exist if n = p. D. The sum will always exist.