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2 years ago

Plese help me i am very stuck

Mathematics

2 answers:

Katyanochek1 [597]2 years ago

8 0

$\begin{array}{|c|ll} \cline{1-1} \textit{a\% of b}\\ \cline{1-1} \\ \left( \cfrac{a}{100} \right)\cdot b \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{9\% of 268000}}{\left( \cfrac{9}{100} \right)268000}\implies 24120~\hfill \stackrel{\stackrel{current~value}{268000+24120}}{292120}$

cricket20 [7]2 years ago

7 0

Answer:

The house's value increased by $24,120. The current value of the house is $292,120

Step-by-step explanation:

First off, we need to multiply the percentage (9%) by the previous value of $268,000. In order to do that, we need to turn the percentage into a decimal. So, 9% → .09

268,000 x .09 = 24,120

Now you can add this number to the previous house value to get your current house value. (Your house increase in value by 24,120)

24,120 + 268,000 = 292,120

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A random sample of n 1n1equals=139139 individuals results in x 1x1equals=3737 successes. An independent sample of n 2n2equals=14

gulaghasi [49]

Answer:

$z=-2.32$

$p_v =P(Z$

If we compare the p value and using any significance level for example $\alpha=0.05$ we see that $p_v$ so we can conclude that we have enough evidence to reject the null hypothesis, and we can say the the proportion 1 is significant lower than the proportion 2 at 5% of significance.

Step-by-step explanation:

1) Data given and notation

$X_{1}=37$ represent the number of people with characteristic 1

$X_{2}=58$ represent the number of people with characteristic 2

$n_{1}=139$ sample 1 selected

$n_{2}=147$ sample 2 selected

$p_{1}=\frac{37}{139}=0.266$ represent the proportion of people with characteristic 1

$p_{2}=\frac{58}{147}=0.395$ represent the proportion of people with characteristic 2

z would represent the statistic (variable of interest)

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

2) Concepts and formulas to use

We need to conduct a hypothesis in order to check if the proportion 1 is less than the proportion 2, the system of hypothesis would be:

Null hypothesis: $p_{1} \geq p_{2}$

Alternative hypothesis: $p_{1} < p_{2}$

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

$z=\frac{p_{1}-p_{2}}{\sqrt{\hat p (1-\hat p)(\frac{1}{n_{1}}+\frac{1}{n_{2}})}}$ (1)

Where $\hat p=\frac{X_{1}+X_{2}}{n_{1}+n_{2}}=\frac{37+58}{139+147}=0.332$

3) Calculate the statistic

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

$z=\frac{0.266-0.395}{\sqrt{0.332(1-0.332)(\frac{1}{139}+\frac{1}{147})}}=-2.32$

4) Statistical decision

For this case we don't have a significance level provided $\alpha$ we can assuem it 0.05, and we can calculate the p value for this test.

Since is a one left tailed test the p value would be:

$p_v =P(Z$

So if we compare the p value and using any significance level for example $\alpha=0.05$ we see that $p_v$ so we can conclude that we have enough evidence to reject the null hypothesis, and we can say the the proportion 1 is significant lower than the proportion 2 at 5% of significance.

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3 years ago

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Harrizon [31]

Answer:

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3 years ago

What is the area of this parallelogram

murzikaleks [220]

Answer:

84m^2

Step-by-step explanation:

The area of a parallelogram is calculated by multiplying height to the base

The height of the given parallelogram is 7m and the base is 12m

12 × 7 = 84

4 0

2 years ago

2. An arc is a smooth piece of a circle. A major arc of a circle is an arc that is

Maru [420]

Answer: Major arc = ∅/360 (2πr)

Step-by-step explanation: Just as the question stated, an arc is a smooth piece of a circle. Simply put, it is a portion of the entire circumference. The arc is usually bounded by an angle at the center of the circle (very similar to a slice of pizza). Using a slice of pizza as a classic example, the outer edge where the slice is pulled out from is the length of the arc, while the angle at the tip which is pulled out from the center is the angle that encloses the arc.

Just as a slice of pizza is a minor part of the whole shape, in the same way an arc is a minor part of a circle. However, to calculate the length of the arc, the angle at the center which encloses the arc must be given and the radius of the circle must also be given.

If an arc runs around a circle and turns out to be longer than half of the entire length of the circumference, it is labelled as a major arc. Basically, the formula for calculating the length of an arc is the same for either a minor or a major arc.

Therefore, to calculate the length of an arc, you would need to find the proportion of the circle represented by the arc and that can be calculated by dividing the angle binding the arc by 360 (size of an angle at a point equals 360 degrees). So, if the angle that encloses the arc is 60 degrees for example, then the portion of the circle taken by the arc is given as

60/360

This means the length of the arc (which is a portion of the entire circumference) can be determined by multiplying the portion of the central angle by the entire length of the circumference.

Therefore you can calculate the measure of major arc ABC by applying the formula

Length of an arc = ∅/360 (2πr)

Where ∅ is the angle enclosing the arc at the center of the circle

r is the radius of the circle and

π is usually given as 3.14 (or 22/7)

Please note that for a major arc, the value of ∅ would be greater than 180°. The measurement used in the explanation above is just an example for the sake of ease of explanation.

And where the only the angle measure of the minor arc is given, the angle measure of the major arc can be derived as 360 - angle of minor arc. That is;

Angle of major arc = 360 - angle of minor arc

6 0

3 years ago

Write the Slope Intercept form equation for a line passing<br> through (4,6) and (8,9)<br> A<br> .

Serggg [28]

Answer:

y=3/4x +3

Step-by-step explanation:

Find the slope first. y-y over x-x

Y: 9-6 =3

X 8-4 = 4

so the slope is 3/4

Now choose one of the ordered pairs to use to substitute to find the y intercept or "b" in y=mx + b

I chose 4,6 since the slope has a 4 in the denominator

Use y=mx + b

Y =6 from ordered pair m/slope= 3/4 x= 4 from ordered pair and you are looking for b

6= 3/4 (4) + b

6= 12/4 or 3 + b subtract 3 from both sides

3= b

equation is y=3/4x +3

6 0

3 years ago

Plese help me i am very stuck ​

Plese help me i am very stuck