Evaluate $$ 4+(m-n)^{4} $$ when $$ m=7 $$ and $$ n=5 $$

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Substitute $$ m=7,n=5 $$ into the expression $$ 4+(m-n)^{4} $$.
Evaluate the expression by following steps:
- step0: Evaluate:
  $$4+\left(m-n\right)^{4}$$
- step1: Substitute:
  $$4+\left(7-5\right)^{4}$$
- step2: Subtract the numbers:
  $$4+2^{4}$$
- step3: Evaluate the power:
  $$4+16$$
- step4: Add the numbers:
  $$20$$
$$ 4+(7-5)^{4} = 4+16 = 20 $$

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