The area of the pentagon, rounded to the nearest tenth will be 32.7 square cm. Then the correct option is C.
<h3>What is a polygon?</h3>
The polygon is a 2D geometry that has a finite number of sides. And all the sides of the polygon are straight lines connected to each other side by side.
A regular pentagon has an apothem measuring 3 cm and a perimeter of 21.8 cm.
Then the side length of the pentagon will be 
5 x Side length = 21.8 cm
      Side length = 4.36 cm
Then the area of the pentagon, rounded to the nearest tenth will be 
Area of pentagon = 5 x area of triangle 
Area of pentagon = 5 x 1/2 x 4.36 x 3
Area of pentagon = 32.7 square cm
Thus, the correct option is C.
More about the polygon link is given below.
brainly.com/question/17756657
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Answer:
 
 
Step-by-step explanation:
we have
 ------->
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we know that
The formula to solve a quadratic equation of the form  is equal to
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in this problem we have

so
 
substitute in the formula
 
 
Remember that

 
 
 
 
 
        
             
        
        
        
9/10 + 7/100
find the common denominator for 9/10 which is 100
multiply by 10 for 9/10
(9)(10)=90
(10)(10)=100
90/100+7/100
Answer:
97/100
 
        
                    
             
        
        
        
Group like terms
7d-14d+12-3
add them 
-7d+9