Answer: For more Information and insight.
Step-by-step explanation:
The use of historical and comparative existing data is important to students because it gives them an insight on what they are working on.
Previous datas contains certain informations from which new observations and assessments can be made.
Students uses existing data to compare and contrast different factors like if there was a rise or fall in the system they are working on, the also check if an major changes occurred or things were significantly the same from the past to present.
Answer: ∠1 = 109° ∠2 = 71°
<u>Step-by-step explanation:</u>
If the two angles form a linear pair, then their sum is 180°
∠1 + ∠2 = 180°
(5x + 9) + (3x + 11) = 180
8x + 20 = 180
8x = 160
x = 20
∠1 = 5x + 9
= 5(20) + 9
= 100 + 9
= 109
∠2 = 3x + 11
= 3(20) + 11
= 60 + 11
= 71
<u> CHECK:</u>
∠1 + ∠2 = 180°
109° + 71° = 180°
180° = 180° 
Step-by-step explanation:
Just do this
2(L+B)
2(18+24)
2×42
84 Ans.
Answer: 26
Step-by-step explanation:
4*43= 172
198-172=26
X equals to 3
27 times 3 is 81 and 9 times 3 is 27
