Tablets, abacuses, and manual tables
a) are no longer used, because of the proliferation of calculators and computers.
b) are examples of aids to manual calculating.
c) were developed in western europe in the late middle ages.
d) replaced hindu-arabic numerals as the preferred way to do calculations.
e) all of the above.

Option: b) are examples of aids to manual calculating.

Explanation:

The tablets, abacuses, and manual tables were considered to use in the early period for manual calculating. Tablets from the Babylonians period and Rome became famously known for hand-abacus. Abacuses which we know today came into existence in China, a device to count larger numbers which were not possible with ten fingers in the early times.

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.

carefully examine the map above. based on your knowledge of colonialism in africa, the area attributed to belgium on this map is most likely the democratic republic of the congo.