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Ad libitum [116K]

3 years ago

10

Marthas kitchen is 12 feet long and 10 feet wide.she wants to extend the kitchens length by 3 feet.what will happen to the area

of kitchen if this extension is made

1 answer:

stepladder [879]3 years ago

6 0

The area will increase by 30 feet

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Use mental math to find the unknown number in the equation 12 x b= 480

makkiz [27]

So find out what times twelve equals 48. Then add a zero in front and that is your answer.

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3 years ago

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In September 2011, Gallup surveyed 1,004 American adults and asked them whether they blamed Barack Obama a great deal, a moderat

Alexus [3.1K]

Answer:

The 99% confidence interval for the proportion of all American adults who blame Barack Obama a great deal or a moderate amount for U.S. economic problems is (0.4894, 0.5706)..

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

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

$n = 1004, \pi = 0.53$

99% confidence level

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.53 - 2.575\sqrt{\frac{0.53*0.47}{1004}} = 0.4894$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.53 - 2.575\sqrt{\frac{0.53*0.47}{1004}} = 0.5706$

The 99% confidence interval for the proportion of all American adults who blame Barack Obama a great deal or a moderate amount for U.S. economic problems is (0.4894, 0.5706)..

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3 years ago

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Answer:

x = 64

z = 98

y= 18

Step-by-step explanation:

x = 64

64+z+18 = 180

z = 180-82 = 98

y= 18

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3 years ago

Pilar and Ravi start at opposite ends of a 55-mile bike trail. They start riding their bikes toward each other at the same time.

Lynna [10]

Answer:

Ravi’s average speed is 7 miles per hour

Step-by-step explanation:

In this question, we are tasked with calculating what Ravi’s average speed was.

We must know that the term average speed is mathematically equal to Total distance/ Total time

We already have the time of 3 hours, what is needed is the distance.

From the question, we can see that they met at the point where Pilar had travelled 55 miles. What this means is that Ravi would have traveled (55-34) miles to this point since they are coming in opposite direction. This means that Ravi had traveled 21 miles

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4 years ago

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Step-by-step explanation:

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