Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

What does this Rebus Picture mean?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

There was a blind man. He had four socks in his drawer either black or white. He opened it and took out two socks. Now the probability that it was a pair of white socks is 1/2.

Can you find out the probability that he had taken out a pair of black socks ?

Which of the below owl is odd one out?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

I don't get anymore wetter, no matter how much rain falls on me.

Nodes are shown below and you need to connect them based on the following rule: Every node can be connected to the number of nodes inside them, i.e. the first node there is a value of 1 which indicates that the first node can connect to exactly one node only.Can you do it?

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?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?