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3 years ago

I need to slove −7x ^2 +x+9=−6x

Mathematics

1 answer:

guapka [62]3 years ago

4 0

Answer:

1. if you are solving using the quadratic formula. the answer is in the first picture.

2. if you are looking to completing the square the answer is in the second picture.

Step-by-step explanation:

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Let

Citrus2011 [14]

Answer:

hi or high

Step-by-step explanation:

so you right the world h and i and cobine them to make hi or high same thing

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3 years ago

Pleeeeeeassesesesaerxvdrcgcdrcxf help me

Aleksandr-060686 [28]

Answer:

The solution is r <u>></u> 7.

Closed circle at 7 with an arrow pointing to the right

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

It is known that the population variance equals 484. With a .95 probability, the sample size that needs to be taken if the desir

Ksju [112]

Answer:

We need a sample size of at least 75.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.025 = 0.975$ , so $z = 1.96$

Now, we find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

The standard deviation is the square root of the variance. So:

$\sigma = \sqrt{484} = 22$

With a .95 probability, the sample size that needs to be taken if the desired margin of error is 5 or less is

We need a sample size of at least n, in which n is found when M = 5. So

$M = z*\frac{\sigma}{\sqrt{n}}$

$5 = 1.96*\frac{22}{\sqrt{n}}$

$5\sqrt{n} = 43.12$

$\sqrt{n} = \frac{43.12}{5}$

$\sqrt{n} = 8.624$

$(\sqrt{n})^{2} = (8.624)^{2}$

$n = 74.4$

We need a sample size of at least 75.

6 0

3 years ago

Read 2 more answers

The graph of the equation y = 3x − 4 is shown. What statement is true about every point on the graph?

SpyIntel [72]

Answer:

Slope is 3

Y- intercept is -4

Doesn't pass through zero.

Linear

Give me options and I can give a better answer :)

3 0

2 years ago

In 2015, the population of a town was 8914. The population is expected to grow at a rate of 1.36% each year. At this rate, what

wolverine [178]

Answer:

320904

Step-by-step explanation:

7 0

2 years ago