Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

A man dies of old age on his 25 birthday. How is this possible?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

What work can one never finish?

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?

What word is represented by this rebus?

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

Below, you can see some coding:
January = 1017
February = 628
March = 1335
April = 145
May = 1353
June = 1064
July = 1074
August = 186

Now deciphering the way it has been coded, can you find out how September will be coded?