Intervals of Increasing/Decreasing

Express the following in Interval Notation
 -9 < x ≤ -4 

• [-9, -4]
• (-9,-4]
• [-9, -4]
• (-9,-4)

Can you use the symbols "[" or "]"

with infinity?

• Yes

• No

Write the following in interval notation
 x < 5

• (5, ∞)

• (5, -∞)

• (-∞, 5)

• [-∞, 5]

Express the following in Interval Notation
-9 < x < -8.5

• [-9, -8.5]
• [-9, -8.5)
• (-9, -8.5]
• (-9, -8.5)

Is the highlighted section of the graph increasing, decreasing or no change?

• increasing

• decreasing

• no change (stopped)

Is the highlighted section of the graph increasing, decreasing, or no change?

• increasing

• decreasing

• no change (stopped)

Is the highlighted section of this graph increasing, decreasing or no change?

• increasing

• decreasing

• no change (stopped)

• Increasing

• Decreasing

• Constant

Which part of the following graph is there no change (stopped)?

• part A

• Part B

• Part C

• Part D

Check all the intervals where this graph is decreasing.

• (-∞, -1)

• (-1, 0)

• (0, 1)

• (1, ∞)