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vazorg [7]
3 years ago
13

Quinn tried to evaluate an expression step by step. which step did she do wrong there is a selection for not mistake

Mathematics
2 answers:
kkurt [141]3 years ago
6 0

Answer:

she didn't make any mistake

Step-by-step explanation:

She has expressed it correctly and if we calculate, the multiplication is also correct

harkovskaia [24]3 years ago
4 0

Answer:

Quinn did not make a mistake. This is because everything she did is correct and also if we calculate the expression without doing anything she did, we see that she has the right answer.

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Solve the systems of equations using substitution. <br> -3x + 2y = 12<br> x = 2y - 8
ankoles [38]

-3(2y-8) + 2y = 12

-4y + 24 = 12

-4y = -12

y=3

x=2(3)-8

x=-2

4 0
3 years ago
Diego says that the product of 0.51 x 2.427 will have five decimal places. is Diego correct.
zlopas [31]
Yes. There are 2 decimal places in .51 and 3 in 2.427. 
So there would be a total of 5 decimal places.
5 0
3 years ago
Read 2 more answers
In the past decades there have been intensive antismoking campaigns sponsored by both federal and private agencies. In one study
DIA [1.3K]

Answer:

z=\frac{0.384-0.362}{\sqrt{0.374(1-0.374)(\frac{1}{4276}+\frac{1}{3908})}}=2.055    

The p value can be calculated from the alternative hypothesis with this probability:

p_v =2*P(Z>2.055)=0.0399    

And the best option for this case would be:

C. between 0.01 and 0.05.

Step-by-step explanation:

Information provided

X_{1}=1642 represent the number of smokers from the sample in 1995

X_{2}=1415 represent the number of smokers from the sample in 2010

n_{1}=4276 sample from 1995

n_{2}=3908 sample from 2010  

p_{1}=\frac{1642}{4276}=0.384 represent the proportion of smokers from the sample in 1995

p_{2}=\frac{1415}{3908}=0.362 represent the proportion of smokers from the sample in 2010

\hat p represent the pooled estimate of p

z would represent the statistic    

p_v represent the value for the pvalue

System of hypothesis

We want to test the equality of the proportion of smokers and the system of hypothesis are:    

Null hypothesis:p_{1} = p_{2}    

Alternative hypothesis:p_{1} \neq p_{2}    

The statistic is given by:

z=\frac{p_{1}-p_{2}}{\sqrt{\hat p (1-\hat p)(\frac{1}{n_{1}}+\frac{1}{n_{2}})}}   (1)  

Where \hat p=\frac{X_{1}+X_{2}}{n_{1}+n_{2}}=\frac{1642+1415}{4276+3908}=0.374  

Replacing the info given we got:

z=\frac{0.384-0.362}{\sqrt{0.374(1-0.374)(\frac{1}{4276}+\frac{1}{3908})}}=2.055    

The p value can be calculated from the alternative hypothesis with this probability:

p_v =2*P(Z>2.055)=0.0399    

And the best option for this case would be:

C. between 0.01 and 0.05.

7 0
3 years ago
Which of the following functions best describes this graph?
natita [175]
The answer is A sorry if I’m wrong
4 0
2 years ago
-3x=x-(6-2x) solve it
frutty [35]

Answer:

x=1

Step-by-step explanation:

-3x=x-(6-2x)

-3x=x-6+2x

-3x=3x-6

6=3x+3x

6=6x

x=6/6

x=1

Best answer if it helped, please

3 0
3 years ago
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