Step-by-step explanation:
A whole number that is not able to be divided by two into two equal whole numbers. Example: 1, 3, 5, and 7 are odd numbers
-2 x 7 - 2 x 2n
(I think??)
Answer:
The | signs are absolute value signs. Absolute value just makes a negative value turn positive, because technically there is no negative value. For example |-x+5| turns into x+5. If it's already positive, it stays the same. So basically, they're just acting as parenthesis right now. Just distribute the 3 and get 3x+15=7. subtract 17 and get 3x=-8. Divide both sides by three, and you should get x= -8/3. But wait, there's more. Since this is an absolute value equation, there should be more than one answer. Simply make the number on the other side negative. 3x+15=-7. subtract 15 and get -22. Keep going and your answer should be -22/3.
So in conclusion, your two answers are -8/3 and -22/3.
Step-by-step explanation:
We want to compare the means, so find the difference and the corresponding standard deviation:
μ = μ₁ − μ₂
μ = 25 − 23
μ = 2
σ = √(σ₁²/n₁ + σ₂²/n)
σ = √(3.1²/50 + 3.2²/50)
σ = 0.63
Using a 95% confidence level, z = 1.96. So the interval is:
CI = 2 ± 1.96 × 0.63
CI = 2 ± 1.2
There is a 95% probability that the true difference in means is between 0.8 and 3.2. Since 0 is not in this interval, we can conclude that there is a significant difference between the commute times for the two populations.
