Answer:
x = - 4
y = - 12
Step-by-step explanation:
x - 8 = 3x
- 8 = 3x - x
2x = - 8
x = - 4
y = 3x = 3(-4) = - 12
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The answers are 9.8 and 10/3
Answer:
1,269 students
Step-by-step explanation:
Z-score for a 90% confidence interval (z) = 1.645
The proportion of students who own their own car (p) = 0.25
Standard error = 0.02
The standard error of a proportion is given by:

Applying the given values, the sample size 'n' needed is:

Rounding up to the next whole student, the sample size needed is 1,269 students.