The equation 5^2+7x-4=0 has only one solution
<u>Solution:</u>
Given, equation is
We have to find the number of solution that the given equation can have.
Now let us solve the given equation to find the number of solutions it has.
So, take the equation
On squaring 5 we get 25
25 + 7x – 4 = 0
7x + 25 – 4 = 0
Adding 25 and -4 we get,
7x + 21 = 0
7x = - 21
x = - 3
Here we got only one value for "x"
Hence, the given equation has only one solution and that is x = – 3
Answer:
The critical value for the 90% confidence interval is .
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 z-score that has a p-value of .
90% confidence level
So , z is the value of Z that has a p-value of
, so
.
The critical value for the 90% confidence interval is .