Which of the following is true about the expression given below? 2/5 less than - 1/2

A.
is the opposite of - 1/2 on a horizontal number line.
B.
is to the left of - 1/2 on a horizontal number line.
C.
is at the same place as - 1/2 on a horizontal number line.
D.
is to the right of - 1/2 on a horizontal number line.
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Mallory flew in total  10,000 miles, rounded :D

Step-by-step explanation:

Since we're using rounding to place values, first we have to have the total amount of miles flown by Mallory, so we make the sum:

3,720 + 5,985 = 9,705 miles

then, we have to round thefirst digit to the right following this rule

0-4 is rounded down

5-9 is rounded up

now, since the number we want to round is the first digit on the left (9), and following the rules above, we change the "9" for a "10". the rest of the numbers are now transformed into zeros (0)

9,705 >>> rounding it up >>> 10,000

Let me know if you have any questions XD