Final answer:Thedecimal number'One and nine tenths' is written in standard form as 1.9. The 'one' is the whole number and 'nine tenths' is the decimal fraction.Explanation:To write the decimal number 'One and nine tenths' instandardform, you would express it numerically. In standard form, 'One and nine tenths' is written as 1.9.The 'one' is represented by the number before the decimal point, and 'nine tenths' is represented by the number after the decimal point.For example, 1.9 isequalto 1+9/10. So, we can see that 'one and nine tenths' is the same as 1.9.Learn more aboutdecimal numberhere:brainly.com/question/31768148#SPJ11The complete question is: Write the following decimal number in standard form. One and nine tenths is:...

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