9x - 4(x - 2) =x + 20
We move all terms to the left:
- 9x -4(x - 2) - (x + 20) = 0
Multiply
- 9x - 4x -(x + 20) + 8 = 0
We get rid of the parentheses.
We add all the numbers and all the variables.
We move all terms containing x to the left hand side, all other terms to the right hand side
6 balloons.............23,94
1 balloon...................x
x=23,94:6
x=$3,99
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Answer:
We are 95% confident that the true proportion of adults overweight is between 0.644 and 0.672
Step-by-step explanation:
We can begin founding the estimated proportion of people overweight:
We need to find a critical value for the confidence level using the normal standard distribution. We know that 95% is the confidence level, then the significance level would be given by and . And the critical value would be given by:
The confidence interval for the true population proportion of interest is given by the following formula:
Replacing the data provided we got:
We are 95% confident that the true proportion of adults overweight is between 0.644 and 0.672
Answer:
-6,-10
Step-by-step explanation: