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Damm [24]
3 years ago
13

What is the solution to -7+h=12?

Mathematics
2 answers:
Musya8 [376]3 years ago
8 0

Answer:

h = 19

Step-by-step explanation:

-7 + h = 12

=> h = 12 + 7 [Transferring (-7) to RHS by changing its sign]

=> h = 19

Rainbow [258]3 years ago
5 0

Answer:

h = 19

Step-by-step explanation:

-7+h=12

Since -7 is a negative and we want to undo the number, add 7 to -7 and 12

h=12+7

h=19

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Someone please help
Nata [24]
D is the answer for the problem
4 0
3 years ago
Problem Page Donna had 2/7 acres of land. She planted 4/5 of it with corn. How many acres did she plant with corn?
Dafna11 [192]

Acres of planted corn = (2/7) * (4/5)

= (2/7) * .8 = 1.6 / 7 acres = 0.2285714286 acres


5 0
3 years ago
A local police chief claims that 31% of all drug-related arrests are never prosecuted. A sample of 500 arrests shows that 27% of
Elis [28]

Answer:

z=\frac{0.27 -0.31}{\sqrt{\frac{0.31(1-0.31)}{500}}}=-1.933  

p_v =P(Z  

If we compare the p value obtained and the significance level given \alpha=0.02 we have p_v>\alpha so we can conclude that we have enough evidence to FAIL reject the null hypothesis, and we can said that at 2% of significance the proportion of arrests that were not prosecuted is not significanlty less than 0.31.  

Step-by-step explanation:

1) Data given and notation

n=500 represent the random sample taken

X represent the number of arrests that were not prosecuted.

\hat p=0.27 estimated proportion of arrests that were not prosecuted

p_o=0.31 is the value that we want to test

\alpha=0.02 represent the significance level

Confidence=98% or 0.98

z would represent the statistic (variable of interest)

p_v represent the p value (variable of interest)  

2) Concepts and formulas to use  

We need to conduct a hypothesis in order to test the claim that the true proportion is less than 0.31.:  

Null hypothesis:p\geq 0.31  

Alternative hypothesis:p < 0.31  

When we conduct a proportion test we need to use the z statisitc, and the is given by:  

z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}} (1)  

The One-Sample Proportion Test is used to assess whether a population proportion \hat p is significantly different from a hypothesized value p_o.

3) Calculate the statistic  

Since we have all the info requires we can replace in formula (1) like this:  

z=\frac{0.27 -0.31}{\sqrt{\frac{0.31(1-0.31)}{500}}}=-1.933  

4) Statistical decision  

It's important to refresh the p value method or p value approach . "This method is about determining "likely" or "unlikely" by determining the probability assuming the null hypothesis were true of observing a more extreme test statistic in the direction of the alternative hypothesis than the one observed". Or in other words is just a method to have an statistical decision to fail to reject or reject the null hypothesis.  

The significance level provided \alpha=0.02. The next step would be calculate the p value for this test.  

Since is a left tailed test the p value would be:  

p_v =P(Z  

If we compare the p value obtained and the significance level given \alpha=0.02 we have p_v>\alpha so we can conclude that we have enough evidence to FAIL reject the null hypothesis, and we can said that at 2% of significance the proportion of arrests that were not prosecuted is not significanlty less than 0.31.  

3 0
3 years ago
-54 + 108 =<br> Thank you!
julsineya [31]

Answer: 54 and welcome

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Mike had 280 dollars to spend on 8 books.After buying them he had 16 dollars. How much did each book cost?
adell [148]
Well, you can't really determine the price of 1 book, but you can find out the average cost.

280 - 16 = 8x (x = cost of 1 book)
264 = 8x
264/8 = 8x/8
33 = x

So the average cost of one book is 33$( A little expensive if I do say so myself)
Hope this helped!
6 0
3 years ago
Read 2 more answers
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