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anzhelika [568]
3 years ago
7

2 × 30 = 2 × (3 × 10)

Mathematics
2 answers:
ad-work [718]3 years ago
6 0

Answer: True

Step-by-step explanation: According to PEMDAS you multiply the numbers in the parentheses so you get 3x10=30 then you multiply 30 x 2=60 so 2x30=2x(3x10)

vampirchik [111]3 years ago
5 0

Answer:They are equivalent, if that's what your trying to find out.

Step-by-step explanation:

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Arlecino [84]

Answer:

V=lwh

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2 years ago
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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
Question is in the picture
MrRa [10]

Answer:

B)  12.5 ft

Step-by-step explanation:

set up a proportion of inches/feet equals inches/feet

let 'h' = height of sign

5.4/18 = 3.75/h

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2 years ago
PLZ IN THIS ASAPP!!! ILL GIVE YOU BRAINLIST!!!
Anastaziya [24]

Answer:

14

Explanation:

The constant of proportionality is 14, when we divide all of the y values by all of the x values, we get 14.

hope this helps!

8 0
2 years ago
Can anyone help me with 15a b c
Ilya [14]
The 3r would be the independent variable and m=30 is the dependent variable. Double check the answer though.
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3 years ago
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