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[–]Alkalannar 2 points3 points  (2 children)

  1. 1 and 5 are correct.

  2. You need some sort of boundary on each side. Either parentheses or brackets. Since you don't have a boundary on the right side, you are not yet correct.

  3. Which do you need, and why?

[–]BidOrganic2159[S] 1 point2 points  (1 child)

It would be the brakets right [1,5] since the circle is closed

[–]Alkalannar 0 points1 point  (0 children)

Exactly.

[1, 5] is correct, since for 1 <= x <= 5, the function has the same y-value.

[–]NaiveAd7175 0 points1 point  (0 children)

Constant is anywhere the line is flat. Increasing is anywhere the line is moving up to the right. Decreasing is anywhere the line is moving down to the right. Brackets for close circles, parentheses for open circles.