evaluate 19 3pi 15 8pi, Factors, Mathematics (O-Level)

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Question:Evaluate 19.3`pi` - 15.8`pi`

Answer 19.3`pi` - 15.8`pi` =`pi`(19.3-15.8)=`pi` `xx`3.5 

                                   = `22/7 xx 7/2`

                                   = 11

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Evaluate 19.3`pi` - 15.8`pi`

Question:Evaluate 19.3`pi` - 15.8`pi`

Answer 19.3`pi` - 15.8`pi` =`pi`(19.3-15.8)=`pi` `xx`3.5 = `22/7 xx 7/2` = 11