Answer:
Simplify the expression: 
Use the exponent power:

Apply the given rules;

Simplify:

then;

Therefore, the simplified expression of
is, 
Answer:
the cost would either be 50 cents or 75 cents
Step-by-step explanation:
Answer:
$6.89 per pair
Step-by-step explanation:
if 4 pairs = 27.56
1 pair = 27.56 / 4
1 pair = $6.89