Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

(1): "^-4" was replaced by "^(-4)".

(2): "4.2" was replaced by "(42/10)".

Step  1  :

 1.1     10 = 2•5

(10)^-4 = (2•5)^(-4) = (2)^(-4) • (5)^(-4)

Equation at the end of step  1  :

  42
  —— • ((2)(-4)•(5)(-4))
  10

Step  2  :

            21
 Simplify   ——
            5 

Equation at the end of step  2  :

  21
  —— • ((2)(-4)•(5)(-4))
  5 

Step  3  :

Multiplying exponents :

 3.1    5¹  multiplied by  5⁴   = 5^{(1 + 4)} = 5⁵

Final result :

     21             
  ——————— = 0.00042 
  (55•24)