Recalling the laws of exponents:
[tex]a^n=a\cdot a\cdot a\cdot\ldots\cdot a\rightarrow\text{ n times}[/tex]The followin expression can be rewritten using exponents:
[tex]7\cdot7\cdot7\cdot7=7^4[/tex][tex]3\cdot3\cdot3\cdot3\cdot3=3^5[/tex]Therefore, the expression:
[tex]\frac{7\cdot7\cdot7\cdot7}{3\cdot3\cdot3\cdot3\cdot3}[/tex]Is equivalent to:
[tex]\frac{7^4}{3^5}[/tex]