Find the unknown number in the proportion. Write your answer as a whole number or a mixed number if possible.
= 
A. x = 
B. x = 
C. x = 21
D. x = 2
Answer: D
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Solve the system of equations by graphing.x - y = 6x + y = 12
A. (18, 6) B. (9, 3) C. (3, 9) D. (6, 18)
Perform the indicated operations and simplify the result. Leave the answer in factored form.
- 
A. 4x B. 8 C. 0 D. 64
Write the given set in interval notation and graph the set on a number line.{x|x ? -2}
A. (-?, -2]
B. (-2, ?)
C. [-2, ?)
D. (-?, -2)
Provide an appropriate response.Which one of the following is a description of the graph of the solution set for the system below?x2 + y2 ? 36 4x2 + 9y2 ? 36
A. The area inside the circle (defined by the first equation) and outside the ellipse (defined by the second equation), including both borders. B. The area inside the ellipse (defined by the second equation), including the border. C. The area inside the ellipse (defined by the second equation) and outside the circle (defined by the first equation), including both borders. D. None of these