Answer:
47
Step-by-step explanation:
the lines are parrele which explains
why its 47
Change % = (77-70)/77 *100
= 100/11 = 9.1 % decrease
option C)
hope it helped
Considering the margin of error, it is found that the 95% confidence interval for the percentage of adults who say vaccines should be required is (64.9%, 71.1%).
<h3>What is a confidence interval?</h3>
It is given by the sample statistic plus/minus the margin of error.
In this problem, 68% of adults say such vaccines should be required, with a margin of error of 3.1%, hence:
68% - 3.1% = 64.9%.
68% + 3.1% = 71.1%.
The 95% confidence interval for the percentage of adults who say vaccines should be required is (64.9%, 71.1%).
More can be learned about confidence intervals at brainly.com/question/25890103
Answer:
A
Step-by-step explanation:
(4+5)7=9*7=63
Use DeMoivre's formula:
(cos(<em>θ</em>) + <em>i</em> sin(<em>θ</em>))<em>ⁿ</em> = cos(<em>n θ</em>) + <em>i</em> sin(<em>n</em> <em>θ</em>)
If a given number is a 5th root of -<em>i</em>, raising it to the 5th power should return -<em>i</em>.
Since -<em>i</em> = cos(-<em>π</em>/2) + <em>i</em> sin(-<em>π</em>/2), you should check any number with an argument <em>θ</em> such that 5<em>θ</em> = -<em>π</em>/2. This happens only for the last choice:
(cos(7<em>π</em>/10) + <em>i</em> sin(7<em>π</em>/10))⁵ = cos(35<em>π</em>/10) + <em>i</em> sin(35<em>π</em>/10)
and 35<em>π</em>/10 is equivalent to -<em>π</em>/2 (modulo 2<em>π</em>).
