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3 years ago

I NEED HELP WITH A MATH QUESTION!!! graph and vertex are included

Mathematics

1 answer:

MrMuchimi3 years ago

3 0

Answer:

Below

Step-by-step explanation:

To find the answers for the table, you must plug in each x value into the equation and get your y value:

x = -1

(-1^2)-(4*-1)-1

1+4-1

When x = -1, y = 4

x=0

(0^2)-(-4*0)-1

-1

When x = 0, y = -1

x = 1

(1^2)-(4-1)-1

1-4-1

-4

When x = 1, y = -4

x = 2

(2^2)-(4*2)-1

4-8-1

-5

When x = 2, y = -5

x = 3

(3^2)-(4*3)-1

9-12-1

-4

When x = 3, y = -4

I made a graph of this shown below.

I also created a table, that answrs your question below.

Hope this helps!

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Susan's property is assessed at $97,500. The property tax rate in her city is 3.05%. Find her property tax.

ki77a [65]

Should be about $2,973.75

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4 years ago

According to one investigator’s model, the data are like 400 draws made at random from a large box. The null hypothesis says tha

tankabanditka [31]

Answer:

$z=\frac{52.75-50}{\frac{25}{\sqrt{400}}}=2.2$

$p_v =2*P(Z>2.2)=0.0278$

If we compare the p value and the significance level assumed $\alpha=0.01$ we see that $p_v>\alpha$ so we can conclude that we have enough evidence to fail reject the null hypothesis, so we can't conclude that the mean is significantly diffrent fro 50 at 1% of signficance.

Step-by-step explanation:

1) Data given and notation

$\bar X=52.75$ represent the mean height for the sample

$s=25$ represent the sample standard deviation

$n=400$ sample size

$\mu_o =50$ represent the value that we want to test

$\alpha$ represent the significance level for the hypothesis test.

t would represent the statistic (variable of interest)

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

State the null and alternative hypotheses.

We need to conduct a hypothesis in order to check if the mean is equal to 50 or not, the system of hypothesis would be:

Null hypothesis: $\mu = 50$

Alternative hypothesis: $\mu \neq 50$

If we analyze the size for the sample is > 30 but we don't know the population deviation so is better apply a t test to compare the actual mean to the reference value but we can assume it as z distribution, and the statistic is given by:

$z=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}$ (1)

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".

Calculate the statistic

We can replace in formula (1) the info given like this:

$z=\frac{52.75-50}{\frac{25}{\sqrt{400}}}=2.2$

P-value

Since is a two sided test the p value would be:

$p_v =2*P(Z>2.2)=0.0278$

Conclusion

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4 years ago

Make a the subject of the formula x²=a²-a²w²

Gwar [14]

Answer: