The half-life of Au-198 is 2.7 days. When there are 800 atoms of Au-198 in a sample, a scientist starts a stopwatch. The scientist stops the stopwatch at 8.1 days, there are atoms of Au-198 remaining.

look it up on google cause i dont know

Explanation:

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i. like it i'm gonna edit it tomorrow

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..