There is not enough information given to answer this question. 0.4mg is what percentage of what quantity?
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Please check your pocket change. It's a common circulation coin with no added value. Huge numbers were minted.
1.03 is already given to exactly two decimal places!
you cannot. you need more info.
strange change
its mass will increase by an amount too small to measure directly
coin money and declare war.
silver dollar
coin money and declare war.
coin money and declare war.
If it was found in change, the coin is face value. A uncirculated coin is about 25 cents.
We have no way of knowing the probability of any given person flipping any given coin at any given time. But for any two flips of an honest coin, the probability that both are tails is 25% . (1/4, or 3 to 1 against)
No, it's a British 10-penny coin. At current exchange rates 10 pence is about 19¢ U.S. so you were very slightly cheated.
coin? vary
Saw.
You could buy 8 6p buttons which would cost 48p. You would receive a 2p coin back. (Or, of course, two 1p coins)