Because of the added insulation to control the temperature inside,the cost of heating and cooling went down
Answer:
We calculate the slop of a line.
How to find the slope:
Pick any two points on a graph
The formula of slope is 
For example we have two points that contains the coordinates (5,2) (7,4)
Inserting them to the formula would result in:

=
Our rate of change is rise 2, run 2.
Solving the expression
we get 
So, Option A is correct.
Step-by-step explanation:
We need to solve the expression: 
Multiplying and dividing by 2-3i

So, solving the expression
we get 
So, Option A is correct.
Keywords: Complex numbers
Learn more about Complex numbers at:
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The answer is 5.477225575.... or 5.5 if you want the simplified ansewer
Answer:
A multiplier of 1.641 corresponds to a percentage increase or decrease of 64.1%.
Step-by-step explanation:
To determine a percentage increase or decrease of a certain number, a calculation consisting of the multiplication of said number by 1 plus the decimals corresponding to the percentage to be increased must be performed. Thus, for example, if you want to increase a number by 50%, you must multiply that number by 1.50. Therefore, if you multiply a number by 1,641, this implies that you are wanting to increase or decrease the initial number by 64.1%.