What seven-letter word has hundreds of letters in it?

Can you solve the maths in the below-given picture equation?

Why Wine Glass Stem is so long?

what one word does the below rebus identifies?

An inspection by the superintendent of St. Joseph School was scheduled on the next day. The class teacher Jenifer knew that he would be asking questions from her class and she would have to choose a pupil to answer. To offer a perfect impression over him, the teacher explained certain instructions to the students to maximise the chances of getting correct answer every time.

What did she say to the students?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

Can you find a five letter word that is left with only two letters if one is removed?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

John is the son of Jacob.
So,
Jacob is the_____of John's father?