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.

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hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.