Final answer:
To express 9x10³ and 5.9x10⁴ in scientific notation, move the decimal point three places to the right for 9x10³ and four places to the right for 5.9x10⁴.
Step-by-step explanation:
To express 9x10³ and 5.9x10⁴ in scientific notation, we need to move the decimal point to the appropriate positions. For 9x10³, the decimal point needs to move three places to the right, resulting in 9,000. So, 9x10³ can be expressed as 9,000.
For 5.9x10⁴, the decimal point needs to move four places to the right, resulting in 59,000. So, 5.9x10⁴ can be expressed as 59,000.