All categories

3 years ago

Vocabulary A ______________ is a set of equations that have the same variables.

Mathematics

2 answers:

atroni [7]3 years ago

8 0

System of equations to be solved simultaneously

Lady_Fox [76]3 years ago

4 0

Hey there!
The correct answer to this question is:
"A system is a set of equations that have the same variable."
If you've ever seen a system, they look a lot like this:
x + y = 12
x - y = 13
As you can see, they both have the same variables, x, and y. They are a set of equations with different methods of solving, and generate an answer in the form of coordinates.
Hope this helps!

You might be interested in

Which expressions are polynomials?

Natasha2012 [34]

1st, 2nd,& 4th. If the variable is in the root or in the denominator / have a negative power, then it is not a polynomial. The 3rd one has the root of y, so it isnt a polynomial.

8 0

3 years ago

Find the distance across the pond I’M MAKJNG THIS 15 POINTS

Vesnalui [34]

Answer:

Step-by-step explanation:

X/25=16/x

Cross multiply to get

X^2=square root 400

Un square to get 20

It’s 20 meters

4 0

3 years ago

on her quiz in social studies meg awnsered 92 % of the questions correctly . On her second quiz she awnsered 27 out of 30 questi

Mandarinka [93]

First quiz in social studies as in the second one it was only 90%

4 0

4 years ago

If a hurricane was headed your way, would you evacuate? The headline of a press release issued January 21, 2009 by the survey re

Nikolay [14]

Answer:

The 98% confidence interval for population proportion of people who refuse evacuation is {0.30, 0.33].

Step-by-step explanation:

The sample drawn is of size, n = 5046.

As the sample size is large, i.e. n > 30, according to the Central limit theorem the sampling distribution of sample proportion will be normally distributed with mean $\hat p$ and standard deviation $\sqrt{\frac{\hat p (1-\hat p)}{n} }$ .

The mean is: $\hat p=0.31$

The confidence level (CL) = 98%

The confidence interval for single proportion is:

$CI_{p}=[\hat p-z_{(\alpha /2)}\times\sqrt{\frac{\hat p (1-\hat p)}{n} },\ \hat p+z_{(\alpha /2)}\times\sqrt{\frac{\hat p (1-\hat p)}{n} }]$

Here $z_{(\alpha /2)}$ = critical value and α = significance level.

Compute the value of α as follows:

$\alpha =1-CL\\=1-0.98\\=0.02$

For α = 0.02 the critical value can be computed from the z table.

Then the value of $z_{(\alpha /2)}$ is ± 2.33.

The 98% confidence interval for population proportion is:

$CI_{p}=[\hat p-z_{(\alpha /2)}\times\sqrt{\frac{\hat p (1-\hat p)}{n} },\ \hat p+z_{(\alpha /2)}\times\sqrt{\frac{\hat p (1-\hat p)}{n} }]\\=[0.31-2.33\times \sqrt{\frac{0.31\times(1-0.33)}{5046} },\ 0.31+2.33\times \sqrt{\frac{0.31\times(1-0.33)}{5046} } ]\\=[0.31-0.0152,\ 0.31+0.0152]\\=[0.2948,0.3252]\\\approx[0.30,\ 0.33]$

Thus, the 98% confidence interval [0.30, 0.33] implies that there is a 0.98 probability that the population proportion of people who refuse evacuation is between 0.30 and 0.33.

7 0

3 years ago

Several years ago, 50% of parents who had children in grades K-12 were satisfied with the quality of education the students r

galina1969 [7]

Answer:

The 95% confidence interval for the proportion of parents that are satisfied with their children's education is (0.4118, 0.4618). 0.5 is not part of the confidence interval, so this represents evidence that parents' attitudes toward the quality of education have changed.

Step-by-step explanation:

We have to see if 50% = 0.5 is part of the confidence interval.

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.