15 bc would be 15 years before 0 so add 15 to 1990 the coin was 2005 years old
1990+15= 2005 years old Hope this helps :)
The ancient coin dated 15 B.C. was 2004 years old in 1990. This is calculated by adding 14 years from 15 B.C. to 1 B.C. with 1990 years from 1 A.D. to 1990 A.D. Therefore, the total age of the coin is 2004 years.
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Penjelasan:1. chain sling grade 80 SWL (tan) = D² × 8 D = √(SWL ÷ 8)D dalam mm, SWL dalam tan2. wire rope sling (fibre core) SWL (tan) = D² × 0.34 D = √(SWL ÷ 0.34)D pun dalam mm, SWL dalam tan jugak