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Let's begin by listing out the information given to us:
The number is 7.856
We are to round the decimal to the place of the underlined digit
The underlined digit is 8 (which is in the tenth place value)
The digit after 8 is 5. This means that we will round up the number (as shown below)
[tex]7.856\approx7.9[/tex]Hence, the number is 7.9