Solution - Power equations

Step  1  :

Equation at the end of step  1  :

Step  2  :

Equation at the end of step  2  :

Step  3  :

            53
 Simplify   ——
            57

Dividing exponents :

 3.1    5³   divided by   5⁷   = 5^{(3 - 7)} = 5^(-4) = ¹/_5⁴

Final result :

   1            
  ——— = 0.00160 
  625