There are approximately 45 hundred species of mammals on Earth and 2.8 x 10 to the 4 species of fish. What is the difference in the number of species? This is SCIENTIFIC NOTATION

45 hundred = 45 * 100 = 4500

2.8 * 10^4 = 28,000

The difference is the result of subtracting the first number from the second number.

28,000 - 4500 = 23,500

The difference is 23,500 = 2.35 * 10^4