Julia went to the grocery store and purchased cans of soup and frozen dinners. Eack

1 answer:

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A system of equations that could be used to determine the number of cans of soup purchased and the number of frozen dinners purchased is:

350x + 500y = 4800

y = 2x

<h3>Definition of variables </h3>

x = number of cans of soup purchased

y = number of frozen dinners purchased.

<h3>Simultaneous equations </h3>

The system of equations are known as simultaneous equations. Simultaneous equations are group of equations that have to be solved together in order to determine the required values.

<h3>Methods used to solve simultaneous equations </h3>

Elimination method
Graph method
Substitution method

To learn more about simultaneous equations, please check: brainly.com/question/25875552

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Ou are trying to estimate the average amount a family spends on food during a year. In the past, the standard deviation of the a

MA_775_DIABLO [31]

Answer:

The answer is "2653".

Step-by-step explanation:

$Sample \ Size = 99\% \ Cl\\\\ E =60 \\\\\sigma= 1200\\\\$

Minimum sample size for Cl level $= 99\%$ and Desired Margin of Error, $E = 60$ is:

$\to P(|\bar{x}-\mu| < E) \geq 1-\alpha \\\\\to P(\frac{\bar{x}-\mu}{\frac{\sigma}{\sqrt{n}}}$

$Margin \ Error = \frac{\text{length of the CI}}{2}\\\\\sigma=1200\\\\\alpha=1 - Confidence =1-0.99=0.01\\\\Z_{\frac{\alpha}{2}}=z_{0.005}=2.58\\\\n\geq (\frac{z_{0.005} \times \sigma }{E})^2 \\\\= (\frac{2.58 \times 1200 }{60})^2\\\\=2662.560\\$