Final answer:
The underlined digit in the number 15.186 is 8, which has a place value in the hundredths place. Rounding the number to the place value of the underlined digit gives us 15.19.
Step-by-step explanation:
The underlined digit in the number 15.186 is 8. The place value of this digit is the hundredths place. To round the number to the place value of the underlined digit, we need to look at the digit to the right of it, which is 6. Since 6 is greater than or equal to 5, we round the underlined digit up to the nearest whole number. Therefore, the rounded number is 15.19.