Final answer:
To express 2.64 x 10⁻³ in decimal notation, move the decimal point three places to the left, resulting in 0.00264.
Step-by-step explanation:
To express the number 2.64 x 10⁻³ in decimal notation, you move the decimal point three places to the left because the exponent on the ten is minus three. Starting with 2.64, you would move the decimal to get 0.264, then 0.0264, and finally 0.00264.
Scientific notation is a way to express very large or very small numbers in a compact form. The negative exponent indicates how many times you should divide by 10, or equivalently, how many places to move the decimal to the left for numbers less than one.