Answer:

Step-by-step explanation:
Part A) About 19/100
Part B) About 4/25
Part C) About 7/20
Part D) About 13/20
30
Step-by-step explanation:
Sn=A1(1-r^n)/(1-r)
Sum of a finite geometric series formula
We know the sum, number of terms and rate, so you plug those in.
-255=A1(1-(-4)^4))/(1-(-4)
-255=A1(1-256)/5
-255=A1(-255)/5
-1275=A1(-255)
5=A1
Hope this helped! Let me know if you have any questions.
Answer:

Step-by-step explanation:
AB = a
AP = 2PQ = 2QB
AB = AP + PQ + QB
= AP +
+ 
AB = 2AP
AP =
-----(1)
And we know QB = 
QB= AP/2 =
---------(2)
Now midpoint of AP =
×
= 
and midpoint of QB =
×
= 
distance between these midpoints =
- 
= 