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Olenka [21]
3 years ago
10

If you were to solve the following systems of equations by using a matrix, which of the following would be your coefficient matr

ix? 5x-y=18 3x+8y=15 (picture as everything in it for better understanding)
A.[5 3,-1 8]
B.[5 -1,3 8]
C.[5 18,3 15]
D.[5 -1 18,3 8 15]

Mathematics
2 answers:
sesenic [268]3 years ago
6 0

the answer on apex is A


DedPeter [7]3 years ago
4 0
C is the only answer




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A survey of 865 voters in one state reveals that 408 favor approval of an issue before the legislature. Construct the 95% confid
katrin [286]

Answer:

The 95% confidence interval for the true proportion of all voters in the state who favor approval is (0.4384, 0.5050).

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}.

For this problem, we have that:

n = 865, \pi = \frac{408}{865} = 0.4717

95% confidence level

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.4717 - 1.96\sqrt{\frac{0.4717*0.5283}{865}} = 0.4384

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.4717 + 1.96\sqrt{\frac{0.4717*0.5283}{865}} = 0.5050

The 95% confidence interval for the true proportion of all voters in the state who favor approval is (0.4384, 0.5050).

6 0
3 years ago
At soccer practice on Saturday morning, Winston's team practiced dribbling for 25 minutes and practiced shooting for 15 minutes.
Hatshy [7]

Answer:

10h20m AM

Step-by-step explanation:

3 0
3 years ago
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Simplify. 14.2 • (–6) ÷ 15 • (–4) ÷ 0.4 A. –56.8 B. –3.55 C. 56.8 D. 3.55
snow_tiger [21]
The answer is C. 56.8
3 0
3 years ago
lily swims a 100-meter race. she swims the first half in 27.8 seconds. she swims the second half in 30.12 seconds. how long does
Luden [163]

we know that

1) Lily swims a 100-meter race

2) She swims the first half in 27.8 seconds

3) She swims the second half in 30.12 seconds

so

To find the total time to swim the whole race sum the time in the first half plus the time in second half

(27.8+30.12)=57.92\ seconds

therefore

<u>the answer is</u>

57.92\ seconds

3 0
3 years ago
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What is 160% of 80kg
andre [41]

Answer:

128kg

Step-by-step explanation:

I don't know how to explain it here the answer

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