Answer:

Step-by-step explanation:
To solve this problem you must apply the proccedure shown below:
1. You have that the quadratic formula is:

2. To solve the quadratic equation you must substitute the values. So, you have that:

Then you have:

3. Therefore, you obtain the following result:

This equation is a linear equation. They form straight lines. In this case, the line goes through the origin of a cartesian plane. It can be rewritten as
y = 2/5x.
The graph looks like this:
convergent is |r|>1
so the answer would have to be less that 1.
answer is A.
Answer:
the third one!
Step-by-step explanation:
Answer:

Option d.
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:

79 percent of adults age 18 years and older in the United States use the Internet.
This means that 
98% confidence level
So
, z is the value of Z that has a pvalue of
, so
.
Which of the following should be used to find the sample size (n) needed?
We have to find n for which 
So the equation is:


Option d.