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sergeinik [125]
2 years ago
9

I need help really bad I don't know how to do this

Mathematics
2 answers:
mixas84 [53]2 years ago
8 0
Complementary angles are 2 angles who add up to 90 degrees. Every one of the angles adds up to 90 degrees, so the assignment is asking you to find the missing number that makes the angles add up to 90.

Example: The first angle on your pager shows 45 and and a question mark. Ask yourself, what number + 45 = 90? The answer is 45. So, take the number of each angle they give you, and subtract it from 90. ( 90 - 45 ) and you have solved what the missing number ( ? ) is. Hope I helped!
NeTakaya2 years ago
5 0
Subtract the degrees shown by 90 since it is a right angle, which mean sit is at 90 degrees. so like for the 1st one, subtract 45 from 90. any questions? 
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fenix001 [56]
No photo?? what are the choices
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Per year. How much interest will she be paid in the first
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The breaking strengths of cables produced by a certain manufacturer have a mean, , of pounds, and a standard deviation of pounds
olchik [2.2K]

The question is incomplete. The complete question is :

The breaking strengths of cables produced by a certain manufacturer have a mean of 1900 pounds, and a standard deviation of 65 pounds. It is claimed that an improvement in the manufacturing process has increased the mean breaking strength. To evaluate this claim, 150 newly manufactured cables are randomly chosen and tested, and their mean breaking strength is found to be 1902 pounds. Assume that the population is normally distributed. Can we support, at the 0.01 level of significance, the claim that the mean breaking strength has increased?

Solution :

Given data :

Mean, μ = 1900

Standard deviation, σ = 65

Sample size, n = 150

Sample mean, $\overline x$ = 1902

Level of significance = 0.01

The hypothesis are :

$H_0 : \mu = 1900$

$H_1 : \mu > 1900$

Test statics :

We use the z test as the sample size is large and we know the population standard deviation.

$z=\frac{\overline x - \mu}{\sigma / \sqrt{n}}$

$z=\frac{1902-1900}{65 / \sqrt{150}}$

$z=\frac{2}{5.30723}$

$z=0.38$

Finding the p-value:

P-value = P(Z > z)

             = P(Z > 0.38)

             = 1 - P(Z < 0.38)

From the z table. we get

P(Z < 0.38) = 0.6480

Therefore,

P-value = 1 - P(Z < 0.38)

            = 1 - 0.6480

             = 0.3520

Decision :

If the p value is less than 0.01, then we reject the H_0, otherwise we fail to reject  H_0.

Since the value of p = 0.3520 > 0.01, the level of significance, then we fail to reject  H_0.

Conclusion :

At a significance level of 0.01, we have no sufficient evidence to support that the mean breaking strength has increased.

4 0
2 years ago
Select the correct answer.
oksano4ka [1.4K]

Answer: \dfrac{1}{3}

Step-by-step explanation:

Favorable outcomes (sum is a multiple of 3): (1,2) , (1, 5), (1,8), (2,1) , (2,4), (2,7) , (3, 3), (3, 6), (4, 2), (4, 5) , (4, 8), (5,1), (5, 4), (5, 7), (6,3), (6, 6).

Number of favorable outcomes (sum is a multiple of 3): 16

Total outcomes = Total outcomes of 6-sided die x Total outcomes of 8-sided die=6 × 8 = 48

Then , the probability of getting numbers whose sum is a multiple of 3:

=\dfrac{\text{favorable outcomes}}{\text{total outcomes}}\\\\=\dfrac{16}{48}=\dfrac{1}{3}

Hence, the required probability =\dfrac{1}{3}

7 0
3 years ago
one week 72 people got a speeding ticket. the next week only 36 people got a speeding ticket. what is the percent of change in s
Ierofanga [76]
50% is the answer im just adding words now so it will go in
8 0
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