Answer:
Step-by-step explanation:
The result of x is nevative one
20% = 0.2
Multiply $64 & 0.2 = $12.8
Subtract original price ($64) with discount amount ($12.8)
$51.2 is Discounted price. (Not including tax)
Answer: 
Step-by-step explanation:
To solve this exercise it is important to remembet the definition Definition of a Logarithm:
If
and, 
, then
is equivalent to
(which is the exponential form).
Knowing this definition and having the following logarithmic equation:

You can identify that:

Therefore, susbtituting values into
, you can rewrite this equation as an exponential equation. Then:
