Question

Can someone help with this

Answer 1

A graph shows the percentage is less than 3% before t=0.437 and after t=22.897.

In Set Notation, this might be written as
(x ≤ 0) ∪ (x ≥ 23)

In Interval Notation, this might be written as
(-∞, 0] ∪ [23, ∞)