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You indicate that M is "more than" or "less than" with the symbols < and >. So if M is less than -3, you write M<-3. If M is more than -3, you write M>-3. But the question wants an answer that is equal to or more than -3. This symbol is not on my keyboard but looks like > with an underline. ----
No.
Yes because 3 km = 3000 m
No. 1 km is 1000 m so 3 km would be 3000 m, which is greater than 4 m.
The expression for m more than 2 is2 + m