In a device delivering a current of 15.0 A for 30 seconds, about 2.81 x 10^21 electrons flow through it. This calculation involves using the relationship between current, time, and charge. The total charge is then converted to the number of electrons using the elementary charge value.
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Fiscal policy involves government spending and tax changes to stimulate the economy, while monetary policy focuses on controlling the money supply and interest rates. Reserve requirements and increasing interest rates are part of monetary policy, while investments in infrastructure, tax cuts, and defense spending fall under fiscal policy. ;