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3 years ago

I need to find the zeros of the function, please

Mathematics

1 answer:

Ira Lisetskai [31]3 years ago

3 0

Move the -2x^2 over to the other side to make it positive and then rewrite in descending order of x's. Like this: 2x^2 - 12X + 18. Factor out a 2 to make things easier: 2(x^2 - 6x + 9). Now factor what's inside the parenthesis. Both signs are the same and they're both negative: (x - )(x - ). It's up to us now to find out what goes inside there with those x's. What adds up to -6 has to multiply to +9. Two 3's fit inside there perfectly: -3-3=-6, and -3*-3=9, so the factors are (x-3)(x-3), and setting those equal to zero according to the Zero Product Property, x-3=0 so x = 3 with a multiplicity of 2.

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Step-by-step explanation:

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4 years ago

Select the best possible first step to solving the system by first eliminating the x variable.

ipn [44]

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thus giving rise to 12x + 20y = 4 eq1 × 4
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You can then just subtract one equation from the other
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3 years ago

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Arte-miy333 [17]

Answer:

The 90% confidence interval for the percentage of people the company contacts who may buy something is between 10.82% and 14%

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

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For this problem, we have that:

$n = 1160, \pi = \frac{144}{1160} = 0.1241$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a pvalue of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.1241 - 1.645\sqrt{\frac{0.1241*0.8759}{1160}} = 0.1082$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.1241 + 1.645\sqrt{\frac{0.1241*0.8759}{1160}} = 0.14$

The 90% confidence interval for the percentage of people the company contacts who may buy something is between 10.82% and 14%

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3 years ago

What’s the answer?

zubka84 [21]

Answer:

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3 years ago

If you flip three fair coins, what is the probability that you'll get at least two heads?

crimeas [40]

Answer:

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Hope this helps

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4 years ago

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