3 years ago

X+3y+2z=1 2x-2y-5z=0 -x+2y+4z=1

Mathematics

1 answer:

jenyasd209 [6]3 years ago

8 0

Step-by-step explanation:

work is shown and pictured

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Answer:

3(2c+d)-4(c-d)+d^2.

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6+9-4+12+9=32.

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4 years ago

Is it proportions or non proportional

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proportional

Step-by-step explanation:

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3 years ago

In an effort to estimate the mean of amount spent per customer for dinner at a major Lawrence restaurant, data were collected fo

larisa86 [58]

Answer:

The 99% confidence interval for the population mean is 22.96 to 26.64

Step-by-step explanation:

Consider the provided information,

A sample of 49 customers. Assume a population standard deviation of $5. If the sample mean is $24.80,

The confidence interval if 99%.

Thus, 1-α=0.99

α=0.01

Now we need to determine $z_{\frac{\alpha}{2}}=z_{0.005}$

Now by using z score table we find that $z_{\frac{\alpha}{2}}=2.58$

The boundaries of the confidence interval are:

$\mu-z_{\frac{\alpha}{2}}\times \frac{\sigma}{\sqrt{n} }\\24.80-2.58\times \frac{5}{\sqrt{49}}=22.96\\\mu+z_{\frac{\alpha}{2}}\times \frac{\sigma}{\sqrt{n} }\\24.80+2.58\times \frac{5}{\sqrt{49}}=26.64$

Hence, the 99% confidence interval for the population mean is 22.96 to 26.64

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4 years ago

Kayla ran 10 miles it took her 60 minutes how many minutes did it take her to run each mile?

Lady_Fox [76]

Answer: 4 hours 30 minutes

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3 years ago

HELP ASAP!!!! thank you if you helped!!!

dlinn [17]

It’s D

I did the work on a calculator and eliminated all the other answer choices.

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3 years ago