Let S be the universal set, where: S = {1, 2, 3, ..., 18, 19, 20}
Let sets A and B be subsets of S, where:
Set A = {1, 10, 11, 12, 14, 15)
Set B = {1, 3, 9, 11, 12, 14, 15, 16, 19, 20}
Set C = {3, 4, 5, 8, 11, 12, 13, 16}
Find the number of elements in the set (AU BUC)
n(AU BUC) =
Find the number of elements in the set (An BNC)
n(An Bn C) = 1

Plz determine whether the polynomial is a difference of squares and if it is, factor it. y2 – 196 is a difference of squares: (y + 14)2 is a difference of squares: (y – 14)2 is a difference of squares: (y + 14)(y – 14) is not a difference of squares

Worth 100 points need the answers asap first row -x^2 2x^2 (x/2)^2 x^2 x is less than 2 x is greater than 2 x is less than or equal to 2 x is greater than or equal to 2 second row -5 -5/2 4 5 •2 is less than x& x is less than 4 •2 is less than or equal to x & x is less than or equal to 4 •2 is less than or equal to x& x is less than 4 •2 is less than x& x is less than or equal to 4

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me