it is a scale that goes from loudest to quietest
eg
LOUDEST
aroplane
whale
traffic
whispering
QUIETEST
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It is usually a fraction, as it is usually shown in a ratio. Decimal and percentages can be used though.
Tautologically!
Scale factor and perimeter are related because if the scale factor is 2, then the perimeter will be doubled. So whatever the scale factor is, that is how many times the perimeter will be enlarged.
The areas are related by the square of the scale factor.
A decimal scale: one that divides inches into tenths.