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3 years ago

Solve this system of equations using any method.

1 answer:

Studentka2010 [4]3 years ago

5 0

If you use the elimination method, add both equations together to eliminate a variable. You will get 5x=15. x=3. Replace x in the equations with 3 to get y =7, so your answer is A, (3,7.) I hope his helped!. Please give brainliest!

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100 POINTS!<br> STATS<br> EXPLANATION NEEDED

Elodia [21]

Answer:

Step-by-step explanation:

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3 years ago

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If you flip a coin and roll a 6-sided die, what is the probability that you will flip a heads and roll a 1

Novosadov [1.4K]

P(H)=1/2, P(1)=1/6

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First and second place in a contest use a ratio to share a cash prize. When first place pays $100 , second place pays $60. How m

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Answer:

$60

Step-by-step explanation:

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3 years ago

An environmentalist wants to find out the fraction of oil tankers that have spills each month. Step 2 of 2 : Suppose a sample of

rewona [7]

Answer:

The 80% confidence interval for the population proportion of oil tankers that have spills each month is (0.199, 0.257).

Step-by-step explanation:

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.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

Suppose a sample of 333 tankers is drawn. Of these ships, 257 did not have spills.

333 - 257 = 76 have spills.

This means that $n = 333, \pi = \frac{76}{333} = 0.228$

80% confidence level

So $\alpha = 0.2$ , z is the value of Z that has a pvalue of $1 - \frac{0.2}{2} = 0.9$ , so $Z = 1.28$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.228 - 1.28\sqrt{\frac{0.228*0.772}{333}} = 0.199$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.228 + 1.28\sqrt{\frac{0.228*0.772}{333}} = 0.257$

The 80% confidence interval for the population proportion of oil tankers that have spills each month is (0.199, 0.257).

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3 years ago

Please help with steps:<br><br> 18 - 24 (divide) (-6)

bekas [8.4K]

Answer:

Solution is 1 (one).

Step-by-step explanation:

The equation $\frac{18-24}{-6}$ can be solved by solving first the expression in the numerator. This is done by solving $18-24=-6$ .
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3 years ago