need help for part a This is chem but there's option for chem so Thank u!

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secondary 4 | A Maths
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secondary 4 A Maths

need help for part a
This is chem but there's option for chem so
Thank u!

Date Posted: 6 years ago

done {{ upvoteCount }} Upvotes

clear {{ downvoteCount * -1 }} Downvotes

I am not

Date Posted: 6 years ago