Answer:
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no one help you this is bad app hahahahaha
Since there are 3 sides and each of those 3 sides are 9 cm, you would multiply 9*3 and your answer would be 27 cm.
The equation of the linear regression is 
<h3>Graphing tool</h3>
To determine the line of best fit, we make use of a graphing tool
See attachment for the graph of the line of best fit
<h3>The equation</h3>
From the graphing tool, we have the following calculation summary
-
Sum of X = 440
- Sum of Y = 3601.5
- Mean X = 44
- Mean Y = 360.15
- Sum of squares (SSX) = 1440
- Sum of products (SP) = 5157
The regression Equation is then represented as:

Where:
and 

Also, we have:


So, the linear regression equation is:

Read more about linear regression at:
brainly.com/question/17844286