Question

bellringer: week 8
nb pg. 33
answer the bellringer in complete sentences.
1 a virus is 0.00000125 m long. round to 3 significant figures and express in scientific notation.

Explanation:

Step1: Identify significant figures

The original number is $0.00000125$. To round to 3 significant - figures, we start counting from the first non - zero digit. Here, the first non - zero digit is 1, and the three significant figures are 1, 2, and 5.

Step2: Convert to scientific notation

Scientific notation is of the form $a\times10^{n}$, where $1\leqslant|a|\lt10$ and $n$ is an integer. For the number 0.00000125, moving the decimal point 6 places to the right gives $a = 1.25$ and $n=-6$.

Answer:

$1.25\times10^{-6}$