Question

Express the number appearing in the following statement in standard form: The universe is estimated to be about $12,000,000,000$ years old.

Answer 1

Express the given number in standard form:

The given statement: The universe is estimated to be about $12,000,000,000$ years old.

Thus, the number appearing in the statement is $12,000,000,000$.

Now, $12,000,000,000=1.2\times 10,000,000,000=1.2\times {10}^{10}$

$\Rightarrow 12,000,000,000=1.2\times {10}^{10}$

Therefore, the statement can be rewritten as "The universe is estimated to be about $1.2\times {10}^{10}$ years old."