Here is that step by step answer :)
Answer:1) c. 5,9,13,17,21
2) a. a1=8, an=an-1 -2
Step-by-step explanation: 1) an=4n+1
⇒ a1=4×1+1=5
a2=4×2+1=9
a3=4×3+1=13
a4=4×4+1=17
a5=4×5+1=21
2) clearly a1=8 and then the terms of series are decreasing by 2
so, an=an-1 -2
X-1/2=-1/2
X= -1/2+1/2
X= 0
Inequality that represents the lengths of the glass:
12 cm < x ≤ 12.2 cm
