Answer :

[tex]\frac { 7 }{ 28 } [/tex]

28 is 4 times 7, so we will rewrite it like that.

[tex]28=4\cdot 7\\ \\ \frac { 7 }{ 28 } =\frac { 7 }{ 4\cdot 7 } [/tex]

7 is 7 times 7, so we will rewrite it like that.

[tex]\frac { 7 }{ 28 } =\frac { 7 }{ 4\cdot 7 } =\frac { 1\cdot 7 }{ 4\cdot 7 } =\frac { 1 }{ 4 } \cdot \frac { 7 }{ 7 } =\frac { 1 }{ 4 } \cdot 1=\frac { 1 }{ 4 } [/tex]

So the simplest form is,

[tex]\boxed { \frac { 1 }{ 4 } } [/tex]
[tex]\sf \frac{7}{28}^{(7}= \frac{1}{4}=\boxed{\sf 0,25}[/tex]