I believe it is D, stratified random sampling.
Hope this helps!!
Answer:

Step-by-step explanation:

Answer:
Every Maths Que can Solve by ABi Nandan Logics
Answer:
a, d, and e
Step-by-step explanation:
Hope it helps and have a great day! =D
~sunshine~
Answer:
40 terms
Step-by-step explanation:
the sum to n terms of an arithmetic sequence is
=
(a₁ +
)
then
(- 4 - 82) = - 1720 ( multiply both sides by 2 to clear the fraction )
- 86n = - 3440 ( divide both sides by - 86 )
n = 40
the series has 40 terms