## Elementary Algebra

9000 = 9 $\times$ $10^{3}$
We need to write 9000 as the product of a number greater than or equal to 1 and less than 10 and an integer power of 10. The number greater than or equal to 1 and less than 10 will be 9. The decimal point has moved 3 places, so the exponent of 10 will be 3. So, 9000 = 9 $\times$ $10^{3}$