given arithmetic sequence is 8,3,-2-7

5.what is the nth term of the given sequence?
a. An=5n+3 b.An=5n-3 c. An= 13-5n d. An=8n-8
6. which of the following is 10th term of the given sequence?
a. -12 b. -27 c.-37 d. -87
7. in finding the 50th term of the given sequence which of the following equations is correct?
a. An=5n+3 b. An=5(50)+3 c. An=8+(50-1)(-5) d. An=8+(50-1)-5
8. which term of the given sequence is -87?
a. -20 b. 15 c. 16 d. 20
9. each of the following is one of the 3 arithmetic means between 2 and 14 except?
a.5 b.8 c. 11 d. 12​