Why Wine Glass Stem is so long?

Can you solve this picture maths equation?

People put me on the table and cut me but do not eat me. What am I?

Dwayne Johnson was running away with the loot from a heist in his car along with Vin Diesel. One tire was punctured and he dropped down to replace it. While changing the wheel, he dropped the four nuts that were holding the wheel and they fell into a drain. Vin Diesel gave him an idea using which they were able to drive till the rendezvous point.

What was the idea ?

Why is the Hole below a Lock?

Which word does the below Plexor means ?

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

Can you start the fire using two pieces of wood?

Can it be possible to build a house that has all its four walls facing towards the South?

Why is the Hole below a Lock?