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1) the ength of line segment is 9cm to the nearest centimeter find the range.
2) A preson is 1.75cm tall to the nearest centimeter find the range.
3) The radius of the earth is 6400km to 2s.f find the range.
4) the distance from the school to market is 9.8km to1d.p find the range.
5) the population of Nigeria is 150million to nearest 10million find the range
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To solve this problem and answer all questions, you need know
the rules of rounding.
For these rules, read from your textbook or from numerous web-sites,
for example, from this one
https://www.factmonster.com/math-science/mathematics/rounding-numbers-rules-examples-for-fractions-sums
In short,
If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up.
Example: 38 rounded to the nearest ten is 40
If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down.
Example: 33 rounded to the nearest ten is 30
So, I will start answering first your question, and will leave the rest on you.
(1) The range is [8.5,9.5). It starts from 8.5 inclusive and ends 9.5 exclusive.
Regarding your second question, as written and printed, it is nonsense,
showing that you do not read what you post.
The height of a person can not be 1.75 cm.
Your writing really upsets/afflicts/distresses me.
THEREFORE, at this point I will stop my explanations.