[Answer] 4. Adding, subtracting, calculations--which of these was an early tool for doing these computations?

Step 1 : Introduction to the question "4. Adding, subtracting, calculations--which of these was an early tool for doing these computations?"

...1. abacus 2. infuser 3. ambush 4. idoneous An abacus is what is calling a counting frame. The origin seems to date to the Mesopotamians in 2700 BC. To ambush an opposing force involves ambushers who hide themselves and then come upon (and attempt to defeat) their enemy. An infuser refers to something which helps vitalize and animate something, often by pouring. A tea infuser is the device which holds a tea bag during the brewing process. Idoneous is an adjective verifying that something or somebody is proper, appropriate and acceptable for a job, a position, or a resolution.

Step 2 : Answer to the question "4. Adding, subtracting, calculations--which of these was an early tool for doing these computations?"

abacus:

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