Scientific Notation

The diameter of Saturn's largest ring is about $4.8\times {10}^5 \mathrm{km}$. Express $4.8\times {10}^5$ in usual form, without commas.

Voyager II flew an indirect course of about $2.3\times {10}^{ 9} \mathrm{km}$ to reach Saturn. Express the statement in standard form.

Write the number $8.9\times {10}^7$ in standard form.

Write the number $7.4\times {10}^3$ in standard form.

Write the number $6\times {10}^5$ in usual form. [Write the number without commas]

Large distances are also measured in light years. One light year is about $9,460,000,000,000 \mathrm{km}$. It is the distance light travels in a year. If this distance can be expressed in scientific notation as $9.46\times {10}^a \mathrm{km}$, then find the value of $a$.

Saturn is about $1,600,000,000 \mathrm{km}$ from the Earth. If this distance is expressed in scientific notation as $1.6\times {10}^a \mathrm{km}$, then find the value of $a$. 

If $31,408,000,000$ can be expressed in scientific notation as $3.1408\times {10}^a$, then find the value of $a$.

If $8,040,000,000$ can be expressed in scientific notation as $8.04\times {10}^a$, then find the value of $a$.

If $790,000,000$ can be expressed in scientific notation as $7.9\times {10}^a$, then find the value of $a$.

If $8,000,000$ can eb expressed in scientific notation as $8\times {10}^a$, then find the value of $a$.

$72,000$ written in scientific notation is $a\times {10}^b$. Find the value of $a\times b$.

If $27,400,000,000=2.74\times {10}^x$, then $x=$_____. 

If $50,000,000,000,000=k\times {10}^x$ where $1\le k<10$, then $k+x=$_____.

If $980,000,000,000=9.8\times {10}^x$, then $x=$_____.

If $54,000,000=5.4\times {10}^x$, then $x=$_____.