The answer depends on the [unspecified] units used for 7.5: if 7.5 micrometres, then to the nearest tenth of a centimetre, it is 0.0 cm.
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if it's in centimetres already then it is rounded to the nearest tenth
42.3
57610.52609 rounded to the nearest tenth of a centimeter is 57610.5 assuming the units in question are already centimeters.
The answer is 2.3 cm
That depends entirely on what you want the perimeter of.