Solve the system of equations (only real solutions) by the elimination method. Check your solutions.
A. {(1, 1), (-1, -1), (1, -2), (-1, 2)}
B. {(1, -2), (-1, 2)}
C. {(1, 0), (-1, 0), (1, -2), (-1, 2)}
D. {(1, 0), (1, 1)}
Answer: C
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Triangle ABC is a right triangle with sides of lengths a, b, and c and a right angle at C. Find the indicated trigonometric function value of A. Rationalize denominators containing radicals.a = 3, b = 2; find cos A.
A. 
B. 
C. 
D. 
Find the median.Cost of cellular phones: $100, $33, $224, $118, $286, $236, $230
A. $175 B. $224 C. $118 D. $230
Write a system of equations associated with the augmented matrix. Do not try to solve.
= 
A. 2x + y = -3 x + 2y = 2 -5x - 5y = 2 B. 2x + y + z = -3 x - 5y = 2 C. 2x = -3 x + y = 2 -5x - 5y = 2
Graph the parabola. State the vertex of the parabola.y = (x + 4)2 + 3
A. vertex (-3, 4)
B. vertex (-4, 3)
C. vertex (3, -4)
D. vertex (4, 3)