reduce the negations for all of the following:
3) ~ (a < --> b)
4) (~a & ~b) & (~c v ~d)
5) a --> (b v ~c)
6) [a --> (b --> ~c)] --> [(~d --> ~e) --> f]
7) ~a v ~b
8) ~(a v b)
9) [~~a v (~b & c)] v (~~d --> ~~~e)
10) ~(a < --> b)

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11

kida saleya punjabi song

the diagram shows you   triangle def with de=4, df=9 and de≠df≠ef.

the sum of the lengths of two triangles' sides are always greater than the length of the third side:

substitute sides lengths:

then 5< ef< 13 (option 3 is true).

def is a scalene triangle with all sides of different lengths (option 5 is true, option 2 is false).

answer: correct choices are 1, 3 and 5