How do you go from 98 to 720 using just one letter?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

Make a sentence consisting of three words that have the whole alphabet.

A father's child, a mother's child, yet no one's son.

Who am I?

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)

What is the word or phrase below?
R | E | A | D

What has 13 hearts but no other organs?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

What has one letter and starts with an E?

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?