Find all real numbers in the interval [0, 2?) that satisfy the equation. cos(2x) - cos(4x) = 0
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Solve the system by the substitution method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. {(1, 1)}
B. infinitely many solutions; {
y - 6x = 2} or {
5y = 30x + 10}
C. no solution; ?
D. {(-1.5, -1)}
Mathematics
Solve the problem.In the weighted voting system 
, the smallest possible value that the quota q can take is
A. 46. B. 23. C. 22. D. 31. E. none of these
Mathematics
Indicate whether the graph of the equation is a circle, an ellipse, a hyperbola, or a parabola. Then graph the conic section.25x2 + 4y2 = 100
A. hyperbola
B. ellipse
C. parabola
D. circle
Mathematics
Perform the indicated operations.-11 - 6 - 5
A. 0 B. -10 C. -12 D. -22
Mathematics