Who created a system of mathematics in which a circle represented 1 and a bar repersented 5

The mayas was the first to create a system of mathematics in which the circle represented a 1 and a bar represented a 5

so The Mayas is the correct answer

ba geologist finds four sedimentary rock she determines that no geologic events have shifted the layers she labeles them a,b,c,dbfrom top to bottom

ww1 weapons: tank. tanks were used for the first time in the first world war at the battle of the somme. they were developed to cope with the conditions on the western front. the first tank was called 'little willie' and needed a crew of 3.