Answer: 8,600
Step-by-step explanation: The 5 in 8,591 is in the hundredths place, so when you round that number, you're rounding to the nearest hundredth. Since the 9 in the next place to the right (the tenths place), is greater than 5, you round the number in the hundredths place to the next greater number, which, in this case, is six; 8,600.