Solve the proportion.
= 
A. {1}
B. {-1}
C. {2}
D. {-2}
Answer: B
Mathematics
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Simplify the expression.cos 8x cos 4x + sin 8x sin 4x
A. cos 12x B. sin 4x C. cos 4x D. sin 12x
Mathematics
Solve the inequality, giving its solution set in both interval and graph forms.
< - 
A. 
-  |
B.
-  |
C.
-  |
D.
-  |
Mathematics
Find the perimeter of the figure. 6
13
A. 26
B. 21
C. 26
D. 13
Mathematics
Find the direction the parabola opens, the coordinates of the vertex, the equation of the axis of symmetry and draw the graph.x = -3y2 + 12y - 7
A. 
opens right; vertex (5, 2);
axis of symmetry y = 2
B. 
opens left; vertex (-5, 2);
axis of symmetry y = 2
C. 
opens left; vertex (5, 2);
axis of symmetry y = 2
D. 
opens left; vertex (5, -2);
axis of symmetry y = -2
Mathematics