If a system has exactly one solution it is called ______________

Nicole Made $231 for 11 hours of work at the same rate how much will she make for 13 hours of work

RSB [31]

Answer: $273

Step-by-step explanation:

231/11 = 21

She makes $21 per hour

21 * 13 = 273

5 0

3 years ago

Alright, can someone that is competent in this concept explain to me about residuals? I am studying for a quiz tomorrow. I will

andrey2020 [161]

Answer:

Hey buddy, here is your answer. Hope it helps you.

Step-by-step explanation:

It is the difference between the dependent variable and a predicted value.Each data point has one residual. Residual = Observed value - Predicted value. A residual is a measure of how well a line fits an individual data point.

8 0

3 years ago

a mural will be painted on a wall that is 63.5 inches high and 7 yards long. The wall also has two windows that are 2.5 square f

nydimaria [60]

So the answer might be 61.0 because if you subtract (-)63.5 with 2.5 it would 61.0 so i dont know ..but good luck and if i fail you im so sorry

5 0

4 years ago

A number of robbers were discussing how best to share some stolen rolls of

kupik [55]

Answer:

83

Step-by-step explanation:

Let the number of robbers be x

If they share 6 rolls each, the tota rolls will be 6x and since they have five remainder, the overall total is then 6x+5

In case they share 7 rolls each, it means they have 7x rolls but here they will be less 8 rolls hence 7x-8 is the overall total.

Equating these two

7x-8=6x+5

Arranging similar terms

7x-6x=8+5

x=13

Therefore, the robbers are 13

The rolla they have will be

6(13)+5=83

Or

7(13)-8=83

6 0

3 years ago

Use a sample n=1400 , p=0.20 and a 99% confidence level to construct a confidence interval estimate of the population proportion

saul85 [17]

Answer:

$0.2 - 2.58\sqrt{\frac{0.2(1-0.2)}{1400}}=0.172$

$0.2 + 2.58\sqrt{\frac{0.2(1-0.2)}{1400}}=0.228$

The 99% confidence interval would be given by (0.172;0.228)

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The population proportion have the following distribution

$p \sim N(p,\sqrt{\frac{p(1-p)}{n}})$

Solution to the problem

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 99% of confidence, our significance level would be given by $\alpha=1-0.99=0.01$ and $\alpha/2 =0.005$ . And the critical value would be given by:

$z_{\alpha/2}=-2.58, z_{1-\alpha/2}=2.58$

The confidence interval for the mean is given by the following formula:

$\hat p \pm z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$

If we replace the values given we got:

$0.2 - 2.58\sqrt{\frac{0.2(1-0.2)}{1400}}=0.172$

$0.2 + 2.58\sqrt{\frac{0.2(1-0.2)}{1400}}=0.228$

The 99% confidence interval would be given by (0.172;0.228)

7 0

3 years ago

If a system has exactly one solution it is called _______________.