Which equation shows the ASSOCIATIVE property? Question 3 options:

6 - 9 + 5 = 6 - (-9) + 5

(6 + (-9) + 5) = (6 + 5) + (-9)

-9 + (6 + 5) = -9 - 6 - 5

(6 + (-9)) + 5 = 6 + (-9 + 5)

Simplify 4 square root of 2 end root plus 7 square root of 2 end root minus 3 square root of 2 . (1 point) 2 square root of 8 8 square root of 2 8 square root of 6 6 square root of 8

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)

How is this equation completed? i cannot find any examples in the book.