Taking 1 BC as -1 and 1 AD as +1
(a) Starting year = 330 BC = (-330) AD
Ending year = 395 AD
The era lasted for = 395 – (-330)
= 395 + 330 = 725 years
(b) Born year = 1114 AD
Death year = 1185 AD
∴ Total age = 1185 – 1114 = 71 years
(c) Turks ruled Egypt in 1517 AD.
Queen Nefertis ruled Egypt in (1517-2900) AD= -1383 AD or 1383 BC.
(d) Archimedes lived between 287 BC and 212 BC.
Aristotle lived between 380 BC and 322 BC.
∴ Aristotle lived during an earlier period.