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3 years ago

25x + 10y = 600 5x - 3y = 70

Mathematics

1 answer:

Nutka1998 [239]3 years ago

6 0

I don’t know what tou want us to figure out, do you want the simplified answer or what x and y are?

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9 x n -20 = 16 what is n?

Nostrana [21]

9 × n - 20 = 16
9n - 20 = 16
+ 20
9n = 36
÷ 9
n = 4
Hope this helps! :)

3 0

3 years ago

The sales tax on a $25,000 car is $1375. What is the sales tax rate?

Slav-nsk [51]

Answer:

$11 sales tax per $200

Step-by-step explanation:

1375/25,000 = 11/200

8 0

3 years ago

Read 2 more answers

Help please! This is hard

Nutka1998 [239]

Answer: 200°C + 273.15 = 473.15K

300K − 273.15 = 26.85°C

I hope this helps bye

7 0

3 years ago

The Wall Street Journal reported that automobile crashes cost the United States $162 billion annually (2008 data). The average c

ivanzaharov [21]

Answer:

$n=(\frac{2.326(500)}{120})^2 =93.928 \approx 94$

So the answer for this case would be n=94 rounded up to the nearest integer

Step-by-step explanation:

Information given

$\bar X$ represent the sample mean

$\mu$ population mean (variable of interest)

$\sigma= 500$ represent the population standard deviation

n represent the sample size

Solution to the problem

The margin of error is given by this formula:

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

And on this case we have that ME =120 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 confidence2 level is 98% or 0.98 then the significance level would be $\alpha=1-0.98=0.02$ and $\alpha/2=0.01$ , the critical value for this case would be $z_{\alpha/2}=2.326$ , replacing into formula (b) we got:

$n=(\frac{2.326(500)}{120})^2 =93.928 \approx 94$

So the answer for this case would be n=94 rounded up to the nearest integer

8 0

3 years ago

Round 3.99998 to 4 decimal places (answer is not 4.0000)

Brums [2.3K]

I need help on this too

4 0

3 years ago