Answer:
1/2
Step-by-step explanation:
AC=18 and A'C'=9
AB(x)=A'B'
18(x)=9
x=9/18
x=1/2
Divide the nonagon radially into 9 congruent, equilateral isosceles triangle. Each triangle has vertex angle of 360°/9 = 40°.
Interior angle of polygon = 180°-40° = 140°.
Sum of interior angles = 9(140°) = 1260°
It's going to be C. 15... You can easily figure this out by using the equation 35 - 20 = x
15.87% of the population does not meet the minimum standards.
We use z-scores to find this probability:
z=(X-μ)/σ = (85-100)/15 = -15/15 = -1
Using a z-table (http://www.-table.com) we see that the area to the left of, less than, this is 0.1587. This is 15.87%.
