Answer:
Step-by-step explanation:
First Group like terms:
Add similar elements:
286 children enter the brass band competition.There are 27 teachers who accompany them and 19 parents.How many people visit the
2 answers:
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Note that 
in the given closed interval, so the area is exactly given by the definite integral
(no absolute values needed!)
Integrating gives
(no absolute values needed!)
Integrating gives