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denis23 [38]
3 years ago
13

Select the correct answer how many solutions for x dose the following equation have 2(x+4)-1=2x+7

Mathematics
1 answer:
gavmur [86]3 years ago
5 0

Answer:

every number is correct.

Step-by-step explanation:

2 (x + 4) - 1 = 2x + 7

2x + 8 - 1 = 2x + 7

2x + 7 = 2x + 7

     - 7          - 7

2x = 2x

/2     /2

x = x

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Area of a square with side length of 4inches
malfutka [58]

Answer:

16 in^{2}

Step-by-step explanation:

multiply 4 by 4

8 0
3 years ago
A Metal rod is 7/8 m long it will be cut into pieces that are each 1/56 meters long how many pieces will be made from the road ?
Katen [24]
Namely, how many times does 1/56 go into 7/8?  well, let's check

\bf \cfrac{\quad \frac{7}{8}\quad }{\frac{1}{56}}\implies \cfrac{7}{8}\cdot \cfrac{56}{1}\implies \cfrac{7}{\underline{8}}\cdot \cfrac{\underline{8}\cdot 7}{1}\implies \cfrac{49}{1}\implies 49
7 0
3 years ago
Test the claim that the proportion of people who own cats is significantly different than 90% at the 0.1 significance level.
VikaD [51]

Answer:

1. H0 : p = 0.9

   H1 : p ≠ 0.9

2. The test is two tailed.

3. Reject the null hypothesis

Step-by-step explanation:

We are given that we have to test the claim that the proportion of people who own cats is significantly different than 90% at the 0.1 significance level.

So, Null Hypothesis, H_0 : p = 0.90

Alternate Hypothesis, H_1 : p \neq 0.9

Here, the test is two tailed because we have given that to test  the claim that the proportion of people who own cats is significantly different than 90% which means it can be less than 0.90 or more than 0.90.

Now, test statistics is given by;

            \frac{\hat p-p}{\sqrt{\frac{\hat p(1-\hat p)}{n} } } ~ N(0,1)   , where,  n = sample size = 100

                                                       \hat p = 0.94 (given)

So, Test statistics = \frac{0.94-0.90}{\sqrt{\frac{0.94(1-0.94)}{100} } } = 1.68

Now, P-value = P(Z > 1.68) = 1 - P(Z <= 1.68)

                                           = 1 - 0.95352 = 0.0465 ≈ 0.05 or 5%

Now, our decision rule is that;

       If p-value < significance level  ⇒ Reject null hypothesis

       If p-value > significance level  ⇒ Accept null hypothesis

Since, here p-value is less than significance level as 0.05 < 0.1, so we have sufficient evidence to reject null hypothesis.

Therefore, we conclude that proportion of people who own cats is significantly different than 90%.

8 0
3 years ago
Lisa will make punch that is 25% fruit juice by adding pure fruit juice to a 2-liter mixture that is 10% pure fruit juice. How m
Black_prince [1.1K]

Answer:

65

Step-by-step explanation:

you just need to add 25 and 10 the subtract it from 100

25+10=35

100-35=65

6 0
3 years ago
there are 12 girls and 16 boys in diving class. One student is randomly selected to dive first. what is the probability that the
Artemon [7]
In probability, you gather data through statistics and from there, determine the chances of how likely an event is going to happen out of the total number of data you've collected. Hence, probability is always expressed as part of a whole. This can be in terms of fraction, decimal or in percentage.

You are given statistics: 12 girls and 16 boys. You solve for the total which is 12+16 = 28. This would be the denominator of your probability. For the numerator, we use the statistics for the girls. Therefore, the probability of selecting a girl to dive first is

Probability = 12/28 = 3/7 or 42.86%
3 0
3 years ago
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