Home > MC2 > Chapter 8 > Lesson 8.2.4 > Problem8-69

8-69.

Since the arrow is pointing to the left, that means that all those values are less than the selected point.

x < 3

Therefore, any value to the left of 3 is less than 3. Since the circle above the selected point is open, the point itself is not included and we use either < or >.

See part (a).

Notice that this time the circle above the selected point is shaded in, so the point itself is included. That means we will use either ≤ or ≥. Since the arrow is pointing to the right, that means that all those values are greater than the selected point.