2. To plot t-5<4 on the number line, we first isolate t by adding 5 to both sides:
t - 5 < 4
t - 5 + 5 < 4 + 5
t < 9
This means that any value of t less than 9 will satisfy the inequality. To plot this on the number line, we draw an open circle at 9 (since t cannot be equal to 9) and shade to the left of it, indicating all values of t less than 9:
<---[==============o------------------->
6 7 8 9 10 11
4. <---[-------------------●------------------->
n ≤ 21
18 19 20 21 22 23 24