Can you replace the question mark with the correct number in the below table sequence?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

What can you serve, but never eat?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

In The 1st month of this year(the year 2013), I noticed that the date 13-1-13 (13 January 2013) is special.

This date is special as:

Date * Month = Year.

Can you figure out which year of this century has a maximum number of such dates?

What does this rebus means ?

PROG WORKRESS

What goes up but never comes down?

Some friends went on a vacation to a resort. It was raining heavily and it kept raining for thirteen days.

When it rained in the morning, the afternoon was beautiful and when it rained in the afternoon, the day was blessed with a clear morning.

Overall, the friends experienced eleven nice mornings and twelve nice afternoons. Can you find out the number of days they spent on vacation?

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.