The New York museum attracted 6,274,289, while the Chicago museum attracted 5,772,857.
Round to the nearest million. Note that if the number in the hundred-thousands place value is 5 or greater, round up. If it is 4 or less, round down.
6,274,289 => 6,000,000
5,772,857 => 6,000,000
Combine the two terms
6,000,000 + 6,000,000 = 12,000,000
a) 12,000,000 is your answer
hope this helps