Here guys more points if you want them

About 400,000 people visited an art museum in december. what could be the exact number of people who visited the art museum?

Estimate the product. round the first factor to the nearest whole number, round the second factor to the nearest ten, and then multiply. 3 8/9 × 96

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?