Siti Nur Atiqah's answer to tiffany's Secondary 4 E Maths Singapore question.

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Siti Nur Atiqah
Siti Nur Atiqah's answer
1 answers (A Helpful Person)
1st
So sorry but i forgot how to do (c) cuz its lile 2am and my brain is so fuzzy. Hope someone can help out on the last part and check my other 2 questions whether are they correct or not too