Answer:
a^n=-9+(n-1).5
Step-by-step explanation:
Arithmetic sequence=a+(n-1)d
a=-9
n=?
d=+5
Arithmetic sequence=-9+(n-1)5
=-9+5n-5
Collect like terms
-9-5+5n
-14+5n
So the final answer is
an=-9+(n-1).5
X=20,-16 but i don't sure
Option 2 would be biased. Asking people participating in a walkathon means you are asking people that are already volunteering. To get a non-biased sample, you have to be sure that you are including people that are not guaranteed to be volunteers; you don't have that in this situation.
The answer to your problem is A because you must add them altogether but i might be wrong im just trying to help you out
Answer:
-3-(-7)=4 ,-7-(-3)=-4
Step-by-step explanation:
+ × += +
- × - = +
