Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Birbal was jester, counsellor, and fool to the great Moghul emperor, Akbar.
The villagers loved to talk of Birbal's wisdom and cleverness,
and the emperor loved to try to outsmart him.
One day Akbar (emperor) drew a line across the floor.
"Birbal," he ordered, "you must make this line shorter, but you cannot erase any bit of it."
Everyone present thought the emperor had finally outsmarted Birbal.
It was clearly an impossible task.
Yet within moments the emperor and everyone else present had to agree that Birbal had made the line shorter without erasing any of it.
How could this be?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?

If you say my name, I will no longer exist. What am I?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

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