Question

1. isabelle’s science teacher informed their class that a standard piece of paper weighs about 0.0045 kg. express the weight of the piece of paper using scientific notation.

Explanation:

Step1: Recall scientific notation rules

Scientific notation is in the form \( a \times 10^n \), where \( 1 \leq |a| < 10 \) and \( n \) is an integer.

Step2: Rewrite 0.0045

To get \( a \) between 1 and 10, we move the decimal point 3 places to the right: \( 0.0045 = 4.5 \times 10^{-3} \) (since we moved the decimal to the right, \( n \) is negative, and the number of places moved is 3).

Answer:

\( 4.5 \times 10^{-3} \) kg