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3 years ago

2xsquared - 72= 0 Solve the equation?

Mathematics

2 answers:

34kurt3 years ago

4 0

Answer:

-68

Step-by-step explanation:

Dafna11 [192]3 years ago

3 0

Answer:

x = -6 or x = 6

Step-by-step explanation:

2x^2 - 72 = 0

Divide both sides by 2.

x^2 - 36 = 0

Factor the left side. It is a difference of two squares. The pattern for that is

a^2 - b^2 = (a + b)(a - b). Now we apply that pattern to x^2 - 36 on the left side.

(x + 6)(x - 6) = 0

x + 6 = 0 or x - 6 = 0

x = -6 or x = 6

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In a manufacturing process a random sample of 9 bolts manufactured has a mean length of 3 inches with a standard deviation of .3

Serggg [28]

Answer:

The correct option is (C) (2.769, 3.231).

Step-by-step explanation:

The confidence interval for mean when the standard deviation is not known is:

$CI=\bar x\pm t_{\alpha/2, (n-1)}\frac{s}{\sqrt{n}}$

Given:

$\bar x = 3\\s=0.3\\n=9\\\alpha =1-0.95=0.05$

Compute the critical value as follows:

$t_{\alpha/2, (n-1)}=t_{0.05/2, (9-1)}=t_{0.025, 8}=2.31$

**Use a <em>t</em>-table.

The 95% confidence interval for true mean length of the bolt is:

$CI=\bar x\pm t_{\alpha/2, (n-1)}\frac{s}{\sqrt{n}}\\=3\pm 2.31\times \frac{0.30}{\sqrt{9}}\\ =3\pm 0.231\\=(2.769, 3.231)$

Thus, the 95% confidence interval for true mean length of the bolt is (2.769, 3.231).

The correct option is (C).

7 0

2 years ago

The next two terms are<br> and

kherson [118]

Answer:

The next two terms are 92 and 105.

Step-by-step explanation:

79 + 13 = 92

92 + 13 = 105

4 0

2 years ago

The school band is selling raffle tickets for $2. If Kyle spent p dollars on tickets this week and q dollars on tickets the week

Alex

Answer:

Tickets = p/2 + q/2

Step-by-step explanation:

I don't understand the options, as written.

The answer should be Tickets = p/2 + q/2

If q = 10 and p = 20, Kyle would have bought 5 tickets the week before, and 10 tickets this week.

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Answer:

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Step-by-step explanation:

you subtract 2 from six and that's 4 and 4÷4 is 1

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steposvetlana [31]

Answer:

Step-by-step explanation:

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3 years ago

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