Answer:
A
Step-by-step explanation:
A parabola opening up will have a positive value for the a value in ax^2+bx+c form. Also, the larger the absolute value of the a value, the more narrow the parabola will appear.
Hope this helps!
Hello here is a solution :
<span>f(x) = x3 − 121x = x(x²-121) = x (x² -11²)
</span>f(x) = x (x+11)(x-11)
Answer: 
Step-by-step explanation:
The confidence interval for the difference of two population proportion is given by :-

Given : The first sample consists of 20 people with 9 having a common attribute.
Here,
, 
, 
Significance level : 
Critical value : 
A 95% confidence interval for the difference of two population proportion will be :-

The answer should be 5 over 4