Round 324,650 to the underlined digit and 4 is undrelined

325,000

Step-by-step explanation:

Since 4 is the underlined number, you would have to round 4 by the next digit in the number. 6 is rounded up, so we change the 4 into a 5 and you get 325,000.

twenty-six miles over two gallons because the proportion for the original 13 miles to one gallon would be written 13/1 and, doing the same thing to the top and bottom, i multiplied by 2 and got 26/2