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Next, the maximum number that were in common use at the same time during this period
We have to find time period between 1600 and 1800, when maximum horizontal bars are stacked and have overlap.
1725 to 1790, the three techniques were being used simultaneously. So, the answer is 3 again­[/quote]
­onset of common use means start of the common use between that period.
Common use did start for A and B as well. Can u pls explain this?­[/quote]

The question asks for the *onset*, which means the left side of the bar, or the start of the technique being used. You can see A started around 1550, therefore we do not count it along with B, C, and D.

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guddo

The chart shows 10 techniques that have, at one time or another, been commonly used to construct buildings in Nation X. Each horizontal bar indicates the interval of time, up to the year 2000, during which the associated construction technique was in common use, with the leftmost edge of the bar indicating the onset of common use and the rightmost edge, where visible, indicating the termination of common use.

Select from each drop-down menu the option that completes the statement most accurately.

From 1600 to 1800, the chart shows the onset of common use for exactly of the techniques and, during this time period, the maximum number that were in common use at the same time is .
­Onset means start. So we are looking for the number of techniques that started between 1600 and 1800.
B, C and D start during this period. Thus, the answer is 3.

Next, the maximum number that were in common use at the same time during this period
We have to find time period between 1600 and 1800, when maximum horizontal bars are stacked and have overlap.
1725 to 1790, the three techniques were being used simultaneously. So, the answer is 3 again­
­onset of common use means start of the common use between that period.
Common use did start for A and B as well. Can u pls explain this?­

The question asks for the *onset*, which means the left side of the bar, or the start of the technique being used. You can see A started around 1550, therefore we do not count it along with B, C, and D.

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