Answer:
1.B
2.D
3.C
4.A
hope this helped, msg me if u want more work
Answer:
The common factors should be used in the next step of factoring is x² and -2.
Step-by-step explanation:
Consider the provided expression.

Factor the above expression by grouping.

Factor out x² form the first parentheses and -2 from the second parentheses.

Hence, the common factors should be used in the next step of factoring is x² and -2.
Mean = sum of the observations
--------------------------------
<span> number of observations
</span>=> -3 + (-8) + 12 +(-15)+ 9
-----------------------------------
5
=> mean = -1 ..
Hope it helps!!!!