Answer:
[A]. a + 2(a – 3) = 15
Step-by-step explanation:
To See which equation is true for the value a = 7 Solve all of it.
Start with [A]
[A] a + 2(a – 3) = 15
7+2(7-3)=15
Hence,this is True.
Next ,[B]
[B] 4a-4(14-a)=24
4(7)-4(24-7)= -40
Hence, this is False.
Then, we have [C]
[C] 2a + 47 = 105
2(7) + 47 =61
Hence, this is False.
Now, We have [D]
[D] 3a+2(a-3)=34
3(7)+2(7-3)=29
Hence, this is False.
Lastly, We have [E]
[E] 4a-2a=18
4(7)-2(7)=14
Hence, this is False.
Thus, Correct Answer = [A].a + 2(a – 3) = 15
[RevyBreeze]
Answer:
True
Step-by-step explanation:
Margin of error of a confidence interval:
The margin of error of a confidence interval has the following format:

In which z is related to the confidence level(the higher the confidence level the higher z is), s is related to the standard deviation and n is the size of the sample.
A higher confidence level leads to a larger margin of error, that is, a wider interval. The interval expands around it's lower and upper bounds, which means that if a value is part of a lower confidence interval(such as 95%), it will be part of the higher(such as 99%), and the answer to this question is true.
Answer:
D
Step-by-step explanation: