Use the discriminant to determine whether the graph of the equation is an ellipse (or circle), a hyperbola, or a parabola.8x2 - 7xy + 7y2 - 20 = 0
A. Ellipse or circle
B. Parabola
C. Hyperbola
Answer: A
Mathematics
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Determine the number of subsets of the set.A set of 10 elements
A. 20 B. 512 C. 21 D. 1024
Mathematics
Rewrite the expression as an equivalent expression that does not contain powers of trigonometric functions greater than 1.f(x) = cos3 x
A. 
cos x - 
cos 3x
B. 
cos x + 
cos 3x + cos 2x
C. 
cos x + 
cos 3x
D. 
cos x - 
cos 3x - cos 2x
Mathematics
Solve.Find the perimeter of the triangle. Simplify.
A. 15
meters
B. (9
+ 6
) meters
C. (
+ 
+ 
) meters
D. (60 + 6
) meters
Mathematics
Find the median. Round to the nearest tenth when necessary.12, 18, 30, 49, 64, 68, 77
A. Median = 30 B. Median = 45.9 C. Median = 64 D. Median = 49
Mathematics