<h2>Answer:</h2>
or
4 to the 21st over 5 to the 6th.
<h2>Step-by-step explanation:</h2>First, we need to write our expression. Let's do it step by step:
<u>4 to the 7th:</u>
<u>5 squared:</u>
<u>4 to the 7th over 5 squared:</u>
<u>4 to the 7th over 5 squared all raised to the 3rd power:</u>
<u></u>
Using the law of exponents:
Finally, the answer is 4 to the 21st over 5 to the 6th.