400
Ten years ago, the estimated Austalian koala population was 1,000,000. Today, there are about 100,00 koalas. If N represents the new population and P is the previous population, solve this expression (N-P)/10
(N-P)/10 = ?
(100,000 - 1,000,000)/10 = ?
(-900,000)/10 = -90,000