Kiara Tong's answer to Chong Jia Tao's Secondary 3 E Maths Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Kiara Tong
Kiara Tong's answer
11 answers (A Helpful Person)
q9 ^^ i used the x formula in the last part of the question.