How do you round 9.66 to the nearest tenth

   The 10th position is the 6 right after the dot. The numeral right after the 6 is closer to the next number. So by rounding it, it becomes 9.7 If the digit to the right is 5 or more, you go up a numeral. If it is 4 or less, you keep it at the numeral that it is. If it had been 9.64 then we would have kept it at 9.6 Hope this helps

62.6 per square mile.

Step-by-step explanation:

The U.S. Census found at the population per square mile in the state rose from 128.7 to 191.3 during the last 10 years.

Population at initial year = 128.7

Population after 10 years = 191.3

Population grow per square mile = 191.3 - 128.7

                                                       = 62.6 per square mile.

Population grew 62.6 per square mile.