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frozen [14]
3 years ago
14

If a triangle is a right triangle, then the triangle has 90 angle.

Mathematics
2 answers:
Sloan [31]3 years ago
7 0

Answer:

True

Step-by-step explanation:

Neporo4naja [7]3 years ago
6 0

Yes, but not all angles in the triangle will be 90 degrees.

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If a manufacturer conducted a survey among randomly selected target market households and wanted to be 95​% confident that the d
katen-ka-za [31]

Answer:

We need a sample size of least 119

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}.

The margin of error is:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

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.

Sample size needed

At least n, in which n is found when M = 0.09

We don't know the proportion, so we use \pi = 0.5, which is when we would need the largest sample size.

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.09 = 1.96\sqrt{\frac{0.5*0.5}{n}}

0.09\sqrt{n} = 1.96*0.5

\sqrt{n} = \frac{1.96*0.5}{0.09}

(\sqrt{n})^{2} = (\frac{1.96*0.5}{0.09})^{2}

n = 118.6

Rounding up

We need a sample size of least 119

6 0
3 years ago
A store has clearance items that have been marked down by 25%. They are having a sale, advertising an additional 40% off clearan
Hatshy [7]

Answer: He would pay 45% of the original price.

Step-by-step explanation:

Since we have given that

Let the original price of item be 'x'

Rate mark down by 25%

Amount of marked down would be

\dfrac{25}{100}\times x\\\\=0.25x

Amount after marked down becomes

x-0.25x\\\\=0.75x

Additional clearance items by 40% off

Amount of additional off is given by

\dfrac{40}{100}\times 0.75x\\\\=0.4\times 0.75x\\\\=0.3x

After additional off, the amount becomes,

0.75x-0.3x\\\\=0.45x

Hence, he would pay 45% of the original price.

5 0
3 years ago
Please help me! i need help
Andrej [43]

Answer:

20%

Step-by-step explanation:

400/2000=0.2

0.2*100=20

7 0
3 years ago
Which solid figure is made of only triangular faces?
kakasveta [241]

Answer:

Triangular Pyramid

Step-by-step explanation:

3 0
3 years ago
I'm not sure if this is correct but is it? ​
denpristay [2]

Answer:

That is wrong

Step-by-step explanation:

1.55 rounds up, 7.95 round up. Remember, they are supposed to round down.


Also, if you could label this brainliest that would be a great help!

Thanks xx 

-Dante

6 0
2 years ago
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