Final answer:
The digit in the tenths place of the decimal 19.993 is 9, representing 9 tenths or 0.9.
Step-by-step explanation:
The value of the digit in the tenths place of the decimal 19.993 is 9. The place value system in decimals is similar to whole numbers but extends to the right of the decimal point. The digit immediately to the right of the decimal point represents the tenths place. Each place value is ten times smaller than the place to its left. Therefore, in the decimal 19.993, the first 9 after the decimal point represents 9 tenths, which is 9/10 or 0.9 when expressed as a decimal.