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3 years ago

How can you find x and y in a problem

Mathematics

2 answers:

Solnce55 [7]3 years ago

8 0

Answer:

Ax + By

Step-by-step explanation:

let the number of bags of pretzels bought be A

let the number of drinks be B.

therefore the equation for the total cost C,becomes:

C = Ax + By

Troyanec [42]3 years ago

4 0

This is the explanation i hope it helps sorry for the scribbles

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Use Photomath math it’s really good download it

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What is the order of rotational symmetry for a rhombus?

Ulleksa [173]

Answer:

Step-by-step explanation:

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3 years ago

Read 2 more answers

A marketing researcher wants to find a 96% confidence interval for the mean amount those visitors spend per person per day while

ki77a [65]

Answer:

$n=(\frac{2.054(12)}{4})^2 =37.97 \approx 38$

So then the minimum sample to ensure the condition given is n= 38

Step-by-step explanation:

Notation

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma=12$ represent the population standard deviation

n represent the sample size

ME = 4 the margin of error desired

Solution to the problem

When we create a confidence interval for the mean the margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (a)

And on this case we have that ME =4 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=(\frac{z_{\alpha/2} \sigma}{ME})^2$ (b)

The critical value for 96% of confidence interval now can be founded using the normal distribution. The significance is $\alpha=1-0.96 =0.04$ . And in excel we can use this formula to find it:"=-NORM.INV(0.02;0;1)", and we got $z_{\alpha/2}=2.054$ , replacing into formula (b) we got:

$n=(\frac{2.054(12)}{4})^2 =37.97 \approx 38$

So then the minimum sample to ensure the condition given is n= 38

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3 years ago

Help brainliest for correct answer

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Answer:

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Step-by-step explanation:

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3 years ago

Noah has d dollars to buy s songs from a website. The the website has an initial charge of $5 to join and then $0.99 for each so

Romashka [77]

Answer:

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Step-by-step explanation:

5 dollars is the initial price for the site and each song is 0.99, so if you multiply that by s, the number of songs, you'll get d.

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3 years ago