Solve the equation. If the equation is an identity or a contradiction, state this.3(x - 1) + x = 4(x + 1) - 7
A. ? or { }; contradiction
B. {0}
C. {3}
D. all real numbers; identity
Answer: D
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Express the product as a sum containing only sines or cosines.sin(5?) cos(6?)
A. 
[sin(11?) - sin ?]
B. sin cos(30?2)
C. 
[cos(11?) + sin ?]
D. 
[cos(11?) - cos ?]
Find the probability of the event.A bag contains 3 red marbles, 8 blue marbles, and 7 green marbles. What is the probability of choosing a blue marble when one marble is drawn?
A. 
B. 
C. 
D. 
Solve.It is recommended that there be at least 7 square feet of work space for every person in a conference room. A certain conference room is 16' by 16'. Find the maximum number of people the room can accommodate.
A. 37 people B. 36 people C. 57 people D. 47 people
Provide an appropriate response.For a certain system of two linear equations, the values of the determinants used in Cramer's rule are 
and 
What is the solution set of the system?
A. 
B. 
C. {(23, -13)}
D. 