Answer:
C. 7
Step-by-step explanation:
n is the number of sides of the polygon
[tex](n - 2) \times 180 = 900[/tex]
Divide both sides of the equation by 180
[tex] \frac{(n - 2) \times 180}{180} = \frac{900}{180} \\ n - 2 = 5 \\ n = 5 + 2 \\ n = 7[/tex]
