(X8.6.PS-12
1 answer:
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We are asked to simplify the expression .
- Combine like terms! :)
That's exactly what we need to do - combine like terms.
So, we subtract:
Which gives us:
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Answer:
No solution
Step-by-step explanation:
=> y+3 = y+9
<u><em>Subtracting both sides by y</em></u>
=>
=> 3 ≠ 9
So, This equation has no solution.
Answer:
190
Step-by-step explanation:
Data provided in the question:
Confidence level = 99%
Therefore,
α = 1% = 0.01
[ from standard normal table ]
z-value for = 2.58
Margin of error, E = $0.06
Standard deviation, σ = $0.32
Now,
n =
Here,
n is the sample size (or the minimum number of gas stations )
on substituting the respective values, we get
=
=
= 13.76²
= 189.3376 ≈ 190
Hence,
minimum number of gas stations that she should include in her sample is 190