Answer:
$3.85? 12/3.12 = $3.85
The answer would have came out of 3.84615384615
Then round up the answer to 3.85. So the unit price is $3.85.
How I was taught: Make sure both numbers are a fraction. If not put "1" as the denominator. Multiply straight across. Simplify if you can.
Answer:
We can use excel regression data analysis tool to find the equation of the regression line that best fits the data.
The excel output is attached here.
Therefore, the equation of the linear regression is:

Where:
21.9028 is the intercept and 1.5736 is the slope.
Answer:
First equation is -425
Second equation is 11.25
Step-by-step explanation:
First equation we can write as

computing
When i=0 -> 
When i=1 -> 
...
When i=7 -> 
then replacing each term we have

For the second equation we'll have 9 terms, solving in a similar fashion
When i=1 -> 
When i=2 ->
When i=3 ->
...
When i=9 ->
So we have 0.25 + 0.50 + 0.75 + 1.00 + 1.25 + 1.50+ 1.75 +2.00 +2.25
The rectangle would have a width of 32 cm and height of 16