Answer:

Step-by-step explanation:
1. Subtract 3x from both sides
3x-8y-3x=24-3x
2. Simplify
-8y=24-3x
3. Divide both sides by -8

4. Simply again to get answer.
Answer:
(1) = (e) 7x. (2) = (b) 7+x. (3) = (d) x-7. (4) = (c) 2x+7
Answer:
The variance is 
Step-by-step explanation:
From the question we are told that
The sample size is n = 21
The sum of squares is 
Generally the variance is mathematically represented as

substituting values


Answer:
I don´t know fully but you add by ones on top and add by threes on the bottom
Step-by-step explanation: