Step-by-step explanation:
10000-(10000n/20) = 10000 - (500n)
6500 = 10000 - 500n
3500 = 500n
n = 7
Answer: A, (y-1)^2/49-x^2/81=1
Answer: 9 sides
Step-by-step explanation: : Since the interior angle 140 degrees, the supplement of this is the exterior angle and equal to 40 degrees. Hence the number of sides is 360/40 = 9 sides.
I simplified using formula