Alkali.
This is irrelevant padding to make up the required number of words for an acceptable answer.
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1a + 1b because they are different terms and could not be added together. But 1a × 1b would be 1
3
There is no digit in the thousands column. There is a 1 in the thousandths column.
1569 Does NOT have a hundredths column. NB However '1' is in the 'thousands' column '5' is in the 'hundreds' column (NB Note the spelling) '6' is in the 'tens' column '9' is on the 'units' column. When 'th' is used in the name it refers to the decimal position. In '1569' there is no decimal position.
The 4 is in the tenths column.