6x-2=12x+7
6x-12x-2=12x-12x+7
(-6x)-2+2=7+2
-6x=9
-6x/-6=9/-6
x=-9/6
x=-3/2
Answer:
-16y -10
Step-by-step explanation:
So basically, since there are no parentheses, we can use PEMDAS:
y - 9 * y - 8 * y - 10
y - 9y - 8y - 10
-8y -8y - 10
-16y -10
Answer:
The standard deviation of a mean difference = 5.23
Explanation:
Given:
Standard deviation of a sample taken from population A = 17.6
the number of samples = 25
Standard deviation of a sample taken from population B = 21.1
the number of samples = 30
To find:
the standard deviation of the mean difference
The standard deviation of a mean difference is given as:
The standard deviation of a mean difference = 5.23
Ok. So what I did was I chose a number that would be easy to manipulate The number I chose was 10, I then multiplied it by 4 to get 40, then subtracted 3 to get 37 - that was the first part of the question. The second part wanted me to take the same number, multiply it by 3 and then add 7. So 10 multiplied by 3 is of course 30 and then you just add 7 to get 37. Hey look! Its a match! I hope this helps.
P.S. - If you think I did a good job I would love it if you went to my YouTube channel to see if I can help you more there. Here is the link: https://www.youtube.com/channel/UCG0zQcSsxZ2mu-OnZRdI2-Q . I hope to see you there!
D is the answer to your question