The length of a rectangular room is 6.5 m in the width is 4.23 meters. what is the perimeter of the room? report the answer with appropriate number of significant digits. -21 meters -21.5 meters -21.46 meters -21.460 meters

Perimeter is equal to 2l+2w, or 2 times the length plus 2 times the width. 

So to solve for this you'd take 2(6.5) + 2(4.23). 
2(6.5)= 13
2(4.23)= 8.46

13+8.46= 21.46 meters. 

Based on this, the answer is C. 

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