Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Find the smallest sentence with all the English alphabet.

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

Alex is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alex survive the fire? (There are no buckets or any other means to put out the fire)

Find out the missing number in the picture attached:

What does the below rebus riddle means?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS