In the number 19, the face value of 9 is simply 9 itself, as it is the digit at that place. The place value of 9 in this number is 9 multiplied by the place it occupies, which is the units place. Therefore, the place value of 9 in the number 19 is 9.
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A number does not have a place value - a single digit within a number does.
19
A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the required decimal representation is 19, exactly as in the question.
The Roman numeral XIX has a numeric value of 19.
Say you have an algebraic expression y = 3x +4 For a given value of x = 5 substitute that number in place of x in the expression, so in this case y = 3(5) + 4 = 19