Answer:
6
Step-by-step explanation:
#1: 4x - 8 = 16 (You want to remove -8)
#2: 4x = 24 (In order to remove -8 you need to cancel it out, add 8 to -8, also add 8 to 16)
#3: 4x = 24 (Now you need to get the x by itself, divide 4x by 4 to only get x and also divide 24 by 4)
#4: x = 6
Rule of Thumb: If you do something to one side, to it to the other :)
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<h2><u>
Answer with explanation:</u></h2>
Let 
be the population mean.
Null hypothesis : 
Alternative hypothesis : 
Since Alternative hypothesis is left tailed so , the test is a left tailed test.
Given : n=33 > 30 , so we use z-test.
Test statistic : 
i.e. 
Using z-value table,
P-value for left tailed test =
Since , the p-value (0.0020524) is less than the 0.05 level of significance, it means we reject the null hypothesis.
Therefore, we have enough evidence to support the claim that the mean completion time has decreased under new management.
Answer:
<u><em>X = -1</em></u>
<u><em>Step-by-step explanation:</em></u>
- <u><em>Add x to both sides.</em></u>
- <u><em>8x + 1 + x = -8</em></u>
- <u><em>Combine 8x and x to get 9x.</em></u>
- <u><em>9x + 1 = -8</em></u>
- <u><em>Subtract 1 from both sides</em></u>
- <u><em>9x = -9</em></u>
- <u><em>Divide both sides by 9 </em></u>
- <u><em>x = -9/9</em></u>
- <u><em>x = -1</em></u>
