Hi, pls help to explain and solve the qns. For the pic below I don't understand

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secondary 3 | E Maths
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secondary 3 E Maths Singapore

Hi, pls help to explain and solve the qns. For the pic below I don't understand the workings. Thank you

Date Posted: 1 year ago

done {{ upvoteCount }} Upvotes

clear {{ downvoteCount * -1 }} Downvotes

Hope this helps

Date Posted: 1 year ago

Mary

1 year ago

Thank you very much