Please help me prove the following about Borel measurable functions

Fix a point ac E RR and define for each Borel set I C TR}| 1 if* E E10if * * Ea ) Prove that Ox is a measure .b ) Prove ( from definitions ) that for every Borel measurable function f : R -*10 , too) .f dox = f ( 20 ) .

 

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