Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

I am sure no one can have two things for dinner. what are they?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

If 1+9+8=1, what is 2+8+9?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

what's the probability of getting a king or a queen from a pack of 52 cards?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

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