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eimsori [14]
3 years ago
5

Zoey bought m mangos for $.55 each an a apples for $.89 each. She spent .55m+.89a dollars. What does .55m represent?

Mathematics
1 answer:
svp [43]3 years ago
8 0
The total cost of each mango.
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An article regarding interracial dating and marriage recently appeared in the Washington Post. Of the 1,709 randomly selected ad
VMariaS [17]

Answer:

The 95% confidence interval for the percent of all black adults who would welcome a white person into their families is (0.8222, 0.8978).

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:

323 blacks, 86% of blacks said that they would welcome a white person into their families. This means that n = 323, p = 0.86

95% confidence level

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.86 - 1.96\sqrt{\frac{0.86*0.14}{323}} = 0.8222

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.86 + 1.96\sqrt{\frac{0.86*0.14}{323}} = 0.8978

The 95% confidence interval for the percent of all black adults who would welcome a white person into their families is (0.8222, 0.8978).

5 0
3 years ago
If 7(x-7)=-15 then x =
soldi70 [24.7K]

7(x-7)=-15

distribute

7x-49 =-15

add 49 to each side

7x =34

divide by 7

x = 34/7

x = 4 6/7

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A mean average of 70 or better on five exams is needed for a final grade of C. Jeffery Matthews first four exam grades are 75, 6
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Answer:38

Step-by-step explanation:

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Identify the vertex for the graph of y = −3x2 + 6x − 4.
mixas84 [53]
If the equation is -3x^2+6x-4 then the vertex is (1,-1)
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If (-3+y) is positive, but (-9+y) is negative, what is one number that y could be? *
sukhopar [10]

Answer:

it could be any number less then 9 so examples would be 8,7,6,5,4,3,2,1 so on so forth

6 0
3 years ago
Read 2 more answers
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