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stepan [7]
2 years ago
9

If f(x) = 5x2 + 3, find f(-2) =

Mathematics
1 answer:
Brut [27]2 years ago
8 0

Answer:To find this, all you have to do is plug in 3 where x is in the equation, which gives you this:

f

(

3

)

=

5

(

3

)

−

2

. From there, just find the value:

5

(

3

)

−

2

=

13

.

Step-by-step explanation: 13 is the answers sorry i looks like that

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A survey of 85 families showed that 36 owned at least one DVD player. Find the 99% confidence interval estimate of the true prop
attashe74 [19]

Answer:

0.424 - 2.58\sqrt{\frac{0.424(1-0.424)}{85}}=0.286

0.424 + 2.58\sqrt{\frac{0.424(1-0.424)}{85}}=0.562

The 99% confidence interval would be given by (0.286;0.562)

Step-by-step explanation:

Information given:

X= 36 represent the families owned at least one DVD player

n= 85 represent the total number of families

\hat p=\frac{36}{85}= 0.424 represent the estimated proportion of families owned at least one DVD player

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 99% of confidence, our significance level would be given by \alpha=1-0.99=0.01 and \alpha/2 =0.05. And the critical value would be given by:

z_{\alpha/2}=-2.58, z_{1-\alpha/2}=2.58

The confidence interval for the mean is given by the following formula:  

\hat p \pm z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}

If we replace the values obtained we got:

0.424 - 2.58\sqrt{\frac{0.424(1-0.424)}{85}}=0.286

0.424 + 2.58\sqrt{\frac{0.424(1-0.424)}{85}}=0.562

The 99% confidence interval would be given by (0.286;0.562)

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3 years ago
PLZ HELP! Determine the value of k. Round your answer to the nearest hundredth if necessary.
Anton [14]

Answer:15

Step-by-step explanation

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Answer:

<em>0</em><em>.</em><em>0</em><em>3</em><em>5</em><em> </em><em>gram</em><em>.</em><em>.</em><em>.</em><em>.</em>

Step-by-step explanation:

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2 years ago
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