Answer:
The added values are 180.
Step-by-step explanation:
Answer:
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Answer:
The decision made by the researcher based on this information is to reject the null hypothesis.
Step-by-step explanation:
Two-tailed hypothesis test:
Critical value: 
Test statistic: z
If
, we do not reject the null hypothesis.
If
, we reject the null hypothesis.
In this question:

Since
, we reject the null hypothesis.
The decision made by the researcher based on this information is to reject the null hypothesis.
3+6x+3x+ 6 = 180
9x + 9 = 180
9x = 171
x = 19