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2 years ago

I only need 2 more answers and I will be done.

Mathematics

2 answers:

astraxan [27]2 years ago

7 0

Answer:

Step-by-step explanation:

First find the value for $\frac{x}{3}$

$-5.5+7.5=\frac{x}{3}=2=\frac{2}{1}$

Then figure out what x is like this

$\frac{2}{1}=\frac{x}{3}$

Since the denominator (the bottom number) was multiplied by three we can multiply the numerator (the top number) by three so

$\frac{2}{1}=\frac{6}{3}$

BlackZzzverrR [31]2 years ago

6 0

Answer: B) 6

Step-by-step explanation:

You might be interested in

A sample of gas has a pressure of 21 Pa at 30degF. What would its pressure be at 80degF? The volume of the gas remains constant.

lara [203]

Answer:

23 Pa

Step-by-step explanation:

According to ideal gas law, PV = nRT. If V is constant, then:

P/T = P/T

Remember that P and T are absolute. So °F must be converted to either Rankine or Kelvin.

To convert °F to Rankine, add 459.67.

30°F + 459.67 = 489.67 R

80°F + 459.67 = 539.67 R

21 Pa / 489.67 R = P / 539.67 R

P = 23.1 Pa

Rounded to two significant figures, the pressure is 23 Pa.

6 0

2 years ago

Suppose Connie owns a pet store in a large community that has over 50,000 pet owners. She believes that the proportion of men wh

lakkis [162]

Answer:

$\hat p=\frac{X_{m}+X_{w}}{n_{m}+n_{w}}=\frac{214+215}{510+420}=0.461$

$z=\frac{0.420-0.512}{\sqrt{0.461(1-0.461)(\frac{1}{510}+\frac{1}{420})}}=-2.80$

Since is a two tailed side test the p value would be:

$p_v =2*P(Z$

If we compare the p value and using any significance level for example $\alpha=0.05$ always $p_v$ so we can conclude that we have enough evidence to reject the null hypothesis, and we can say the two proportions are significantly different.

Step-by-step explanation:

Data given and notation

$X_{m}=214$ represent the number of men with cats

$X_{w}=215$ represent the number of women with cats

$n_{m}=510$ sample for men

$n_{f}=420$ sample for women

$\hat p_{m}=\frac{214}{510}=0.420$ represent the proportion of men with cats

$\hat p_{f}=\frac{215}{420}=0.512$ represent the proportion of women with cats

z would represent the statistic (variable of interest)

$p_v$ represent the value for the test (variable of interest)

Concepts and formulas to use

We need to conduct a hypothesis in order to check if the proportions are different, the system of hypothesis would be:

Null hypothesis: $p_{m} = p_{f}$

Alternative hypothesis: $p_{m} \neq p_{f}$

We need to apply a z test to compare proportions, and the statistic is given by:

$z=\frac{p_{m}-p_{f}}{\sqrt{\hat p (1-\hat p)(\frac{1}{n_{m}}+\frac{1}{n_{f}})}}$ (1)

Where $\hat p=\frac{X_{m}+X_{w}}{n_{m}+n_{w}}=\frac{214+215}{510+420}=0.461$

Calculate the statistic

Replacing in formula (1) the values obtained we got this:

$z=\frac{0.420-0.512}{\sqrt{0.461(1-0.461)(\frac{1}{510}+\frac{1}{420})}}=-2.80$

Statistical decision

For this case we don't have a significance level provided $\alpha$ , but we can calculate the p value for this test.

Since is a two tailed side test the p value would be:

$p_v =2*P(Z$

7 0

2 years ago

2 cm

Novay_Z [31]

Answer:

Following are the solution to the given question:

Step-by-step explanation:

In question a:

$\to 16= 4^2$ is a perfect square.

$\to 125 = 5^3$ is not a perfect square

In question b:

$\to 20 = 2 \times 2 \times 5$ , not a perfect square.

$\to 25 = 5^2$ is a perfect square .

$\to 100 = 10^2$ is a perfect square .

$\to 125$ is not a perfect square, its nearest perfect square is $121 = 11^2 .$

$\to 144 = 12^2$ is a perfect square .

$\to 225 = 15^2$ is a perfect square .

$\to 10,000 = 100^2$ is a perfect square .

5 0

2 years ago

Solving the difference between -5 and 2

prisoha [69]

Answer:

Step-by-step explanation:

if you add 7 to -5 you get 2

4 0

2 years ago

What is 78% of 40?? please help me

xxTIMURxx [149]

$p\%=\frac{p}{100}\\\\78\%=\frac{78}{100}=0.78\\\\therefore\\\\78\%\ of\ 40=0.78\cdot40=\boxed{31.2}$

6 0

2 years ago

Read 2 more answers