The simplified expression would be 7a/3 - 5/4. 
 
        
             
        
        
        
We can also classify triangles by their sides.<span>scalene triangle-a triangle with no congruent sides.isosceles triangle-a triangle with at least 2 congruent sides (i.e. 2 or 3 congruent sides)equilateral triangle-a triangle with exactly 3 congruent sides.<span>NOTE:</span></span>
        
                    
             
        
        
        
Answer:
20 side polygon: 180 x (20 -2)
Step-by-step explanation:
A n side polygon can be divided into n-2 triangles
each triangle has 180°
n-2 triangles have 180 x (n-2) degrees
 
        
             
        
        
        
The mean of the data set is 6.8.
<h3>What is the mean?</h3>
Mean is the average value of the given set of observations. In statistics, we also come across different types of mean such as Arithmetic, Geometric and Harmonic mean.
Given
The data set is 14, 7, 2, 8, 3.
The mean of the data set is given by;

Hence, the mean of the data set is 6.8.
To know more about mean value click the link given below.
brainly.com/question/4209766