Answer:
The use of the abacus was expanded and refined.
Explanation:
The abacus was invented during the Yuan Dynasty which lasted between 1206AD till 1368AD and then it was expanded and refined by the Ming Dynasty (1368AD-1644AD).
There have been archaeological proof of this as the writings of Tao Zongyi describes in his book that the new servants, unlike the older and more experienced ones were "just like abacus heads" and that they would not move unless they were made to move. This bears credence to the fact that the abacus was already widely used then.
An abacus was used to count numbers.
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Answer:
C. 25%
Explanation:
Before entering the civil war, confederates states tried to spread a propaganda that only 1% of Southerners own slaves. But, According to the census that conducted by the US government 1860, around 25% of southerners own slaves.
Not a lot of them were being put in plantation as workers (usually only wealthy business owners can afford this). Most of slave owners at that time own slaves as an equivalent of a housemaid. They helped with the chores, taking care of stables, cook, etc.
C: to process uranium and use it to build and perfect atomic weapons
