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Hepta is a prefix. It means 7. A heptagon is a 7 sided polygon.(7 sided shape) 6 7
The kilo- prefix means thousand → 1 km = 1000 m → 7 km = 7 x 1000 m = 7000 m
km means "kilometers"; the prefix "k" or "kilo" means 1000.
"Im" is a common prefix in itself, you don't add a prefix to a prefix.
The deci- prefix means one tenth (1/10) → 1 dg = 1/10 g The milli- prefix means one thousandth (1/1000) → 1 mg = 1/1000 g → 7 mg ÷ 1 dg = (7 x 1/1000 g) ÷ (1 x 1/10 g) = 7/1000 ÷ 1/10 = 7/1000 x 10/1 = 7/100 = 0.07 Meaning there are 0.07 dg in 7 mg