Answer: 2x-3=15
2(9)-3=15
18-3=15
Answer:
We need a sample size of least 119
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of
, and a confidence level of
, we have the following confidence interval of proportions.

In which
z is the zscore that has a pvalue of
.
The margin of error is:

95% confidence level
So
, z is the value of Z that has a pvalue of
, so
.
Sample size needed
At least n, in which n is found when 
We don't know the proportion, so we use
, which is when we would need the largest sample size.






Rounding up
We need a sample size of least 119
Answer:
The orientation is horizontal.
a=2 and b=1
The center is (0,0).
The vertices are (-2,0) and (2,0).
c^2= 5.
The slope is 1/2.
Step-by-step explanation:
I got them right on edge
Answer:
-16
Step-by-step explanation:
3^2-7(3)-4
Step-by-step explanation:
=n2-11n+18
=n2-(9+2)n+18
=n2-9n-2n+18
=n(n-9)-2(n-9)
=(n-2)(n-9)