Question

If the perimeter of a regular pentagon can be expressed as 10s - 20, determine the length of each side.
A. 50s - 100
B. s - 2
C. 5s - 10
D. 2s - 4

Answer 1

Regular pentagon means the shape with 5 sides which their lengths are equal to each other. 

so, if the total perimeter of the pentagon is 10s - 20, 
we can find the length of each side by dividing it by 5.

(10s - 20) / 5

we can expand this equation by dividing each number in the bracket by 5

= 2s - 4

Therefore, the answer should be D.