Solving the expressions
we get 
Step-by-step explanation:
We need to Solve the expression: 
Solving:


Applying exponent rule: 

Another exponent rule says: 

So, solving the expressions
we get 
Keywords: Solving Exponents
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Each day it decrease $2. So just multiply $2 x 4 days. It changed a total of $8.
Answer:
2 and 16/25
Step-by-step explanation: