Question

question 1
jupiter has a circumference of 279,120 miles.
this number written in scientific notation is
question 2
the diameter of a penny is about 0.000019 km wide.
this number written in scientific notation is

Explanation:

Step1: Recall scientific - notation form

Scientific notation is $a\times10^{n}$, where $1\leqslant|a|\lt10$ and $n$ is an integer.

Step2: Convert 279120 to scientific notation

Move the decimal point 5 places to the left to get $a = 2.7912$. Since we moved the decimal point 5 places to the left, $n = 5$. So, $279120=2.7912\times 10^{5}$.

Step3: Convert 0.000019 to scientific notation

Move the decimal point 5 places to the right to get $a = 1.9$. Since we moved the decimal point 5 places to the right, $n=- 5$. So, $0.000019 = 1.9\times10^{-5}$.

Answer:

Question 1: $2.7912\times 10^{5}$
Question 2: $1.9\times10^{-5}$