Question

the half - life of uranium is 2.5 x 10^5 years. what is this in standard form? 2500000 25000 250 250000

Explanation:

Step1: Recall exponent rule

The scientific - notation $a\times10^{n}$ where $n$ is a positive integer means moving the decimal point in $a$ $n$ places to the right.

Step2: Move the decimal point

For $2.5\times10^{5}$, since $n = 5$, move the decimal point in $2.5$ 5 places to the right. $2.5\times10^{5}=250000$.

Answer:

D. 250000