Eric Nicholas K's answer to Kathy's Secondary 4 A Maths Singapore question.

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Eric Nicholas K
Eric Nicholas K's answer
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To add to my last point about Q7 on the expression 7 - 1.5t.

If t is a very large number, then -t is a very large negative number eg -9999999999999...

and of course -1.5t is essentially a large negative number.

Adding 7 to this resulting number still keeps the result a large negative number.