Select all of the following true statements if R = real numbers, N = natural numbers, and W = {0, 1, 2, ...}.
-5W
RW
{0, 1, 2, ...}W
N
9W
WN

The answer is C) w^2+9w+252=0.

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There are 20 students on the school's student council. A special homecoming dance committee is to be formed by randomly selecting 7 students from student council. The number of possible committees is (20x19x18x17x16x15x14)/(1x2x3x4x5x6x7) = 77520

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