Which of the following is correct set notation?
(1,2,3)
1,2,3
{1,2,3}
none of the above

 The correct option is

(C) {1, 2, 3}.

Step-by-step explanation:  We are given to select the correct set notation from the following options :

Option (A) :  The given notation is (1, 2, 3).

Here, the elements are enclosed within first brackets, which is not used to write a set.

So, this option is NOT correct.

Option (B) :  The given notation is 1, 2, 3.

Here, the elements are not enclosed within any brackets. And, the elements of a set is always written within curly brackets.

So, this option is NOT correct.

Option (A) :  The given notation is {1, 2, 3}.

Here, the elements are enclosed within curly brackets, separated by comma. Since this method is used while writing a set, so, this option is CORRECT.

Thus, (C) is the correct option.

d

step-by-step explanation:

given

y + 3 = - 4(x - 2) ← distribute the parenthesis

y + 3 = - 4x + 8 ( subtract 3 from both sides )

y = - 4x + 5 → d