Answer:
[tex]\frac{1}{(28)^{2} }[/tex]
Step-by-step explanation:
Step 1;
Write expression
[tex]4^{-2} . 7^{-2\\\frac{\frac{1}{4^{-2} } }{y\frac{1}{7^{-2} } } }[/tex]
[tex]\frac{1}{4^{2} .7^{2} }[/tex]
[tex]\frac{1}{(4x7)^{2} }[/tex]
[tex]\frac{1}{(28)^{2} }[/tex]
