Answer:
Step-by-step explanation:
a² - b² = (a +b)(a - b)
9x² - 4 = (3x)² - 2²
= (3x + 2 )(3x - 2)
Question 4- is 32.25
question 5- is 12.4
question 6 -is 14/17
question 7 - is 10.7
The answer to this question is A). 39 b). 56
The margin of error given the proportion can be found using the formula
Where
is the z-score of the confidence level
is the sample proportion
is the sample size
We have
Plugging these values into the formula, we have:
The result 0.14 as percentage is 14%
Margin error is 38% ⁺/₋ 14%
You should try this (20+7)+(10+5)=42