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Margarita [4]
3 years ago
7

Solve the system of equations. Must find x, y, and z. Help.

Mathematics
1 answer:
valina [46]3 years ago
7 0

Answer:

x = -1 and y = 2 and z = 1

Step-by-step explanation:

This website can help:

https://www.wolframalpha.com/widgets/view.jsp?id=83d5da9f6682ad1b6002473f314c3b4f

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What math do high schoolers learn? Do they only learn trigonometry, geometry and equations?
EleoNora [17]

Answer:

trigonometry

Step-by-step explanation:

hopes this helps

8 0
2 years ago
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A manufacturer of golf equipment wishes to estimate the number of left-handed golfers. A previous study indicates that the propo
never [62]

Answer:

A sample of 997 is needed.

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 z-score that has a p-value of 1 - \frac{\alpha}{2}.

The margin of error is of:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

A previous study indicates that the proportion of left-handed golfers is 8%.

This means that \pi = 0.08

98% confidence level

So \alpha = 0.02, z is the value of Z that has a p-value of 1 - \frac{0.02}{2} = 0.99, so Z = 2.327.  

How large a sample is needed in order to be 98% confident that the sample proportion will not differ from the true proportion by more than 2%?

This is n for which M = 0.02. So

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.02 = 2.327\sqrt{\frac{0.08*0.92}{n}}

0.02\sqrt{n} = 2.327\sqrt{0.08*0.92}

\sqrt{n} = \frac{2.327\sqrt{0.08*0.92}}{0.02}

(\sqrt{n})^2 = (\frac{2.327\sqrt{0.08*0.92}}{0.02})^2

n = 996.3

Rounding up:

A sample of 997 is needed.

3 0
3 years ago
4 3/4 years equals how many months
irina [24]
1 yr = 12 months
4 yrs= 12x4 = 48 months
3/4 year= 3/4 x12 = 9
so 4 3/4 years= 48+9 =57 months
7 0
3 years ago
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mixer [17]

60 : 13

30 : 6.5

15 : 3.25

6 0
3 years ago
Solve the inequality<br> 3m - 3(m + 8) &gt; 3m
OlgaM077 [116]

Answer:

m<−8

Step-by-step explanation:

7 0
3 years ago
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