Answer:
19.3 m²
Steps:
Area of octagon : 2 ( 1 + √2 ) * a² ........ <u>where a is length of each side</u>
using the formula: 2 ( 1 + √2 ) * 2²
: 2 ( 1 + √2 ) * 4
: ( 8 + 8√2 ) m²
: 19.3 m² ...............our final answer in three significant fig
Answer: 0.0228
Step-by-step explanation:
Given : In a hypothetical study looking at the scores of 100 people in an entrance exam, it was determined that the average score was 95 with a standard deviation of 10.
i.e. 
Let x denotes the scores.
We assume that the scores are normally distributed.
Then, the proportion of individuals in this population have a score greater than 115 will be :-

Hence , the proportion of individuals in this population have a score greater than 115 = 0.0228
Answer:
10
Step-by-step explanation:
If we plug in any negative number as x, the result will always be greater than 4, which rules out answers A and B
lets try plugging in 4 as x to test answer C:
2(8-4)
2(4)= 8
8 is greater than 4, therefore C is wrong.
Lets try 10 as X (answer D):
2(8-10)
2(-2)
-4
We know that -4 is less than 4, therefore it makes the inequality true! :)