Answer: 1.467
Step-by-step explanation:
Formula of Margin of Error for (n<30):-
Given : Sample size : n= 22
Level of confidence = 0.90
Significance level : 
By using the t-distribution table ,
Critical value : 
Standard deviation: 
Then, we have
Hence, the margin of error for the confidence interval for the population mean with a 90% confidence level =1.467
I think you could do
(5+4)×2+6-(2×2)-1
Solve for <span>yy</span> in <span>2x+y=20<span>2x+y=20</span></span>How?
<span>y=20-2x<span>y=20−2x</span></span>
Substitute <span>y=20-2x<span>y=20−2x</span></span> into <span>-5y=-6x+12<span>−5y=−6x+12</span></span>How?
<span>-5(20-2x)=-6x+12<span>−5(20−2x)=−6x+12</span></span>
Solve for <span>xx</span> in <span>-5(20-2x)=-6x+12<span>−5(20−2x)=−6x+12</span></span>How?
<span>x=7<span>x=7</span></span>
Substitute <span>x=7<span>x=7</span></span> into <span>y=20-2x<span>y=20−2x</span></span>How?
<span>y=6<span>y=6</span></span>
Therefore,
<span>x=7<span>x=7</span></span>
<span>y=6<span>y=6</span></span>
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