Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

John and his team plan to rob a safe. They got just one chance to break the code else the local police will be informed. Below are clues:
A) Exactly one number is perfectly placed: 9 8 1
B) Everything is incorrect: 9 2 4
C) Two numbers are part of the code of the safe but are wrongly placed: 0 9 3
D) One number is part of the code of the safe but is wrongly placed: 1 4 7
E) One number is part of the code of the safe but is wrongly placed: 7 8 3

What has many keys but can’t open a single lock?

Prove that the below maths equation is true.

8 + 8 = 91

Which five letter word can be added at the end of below word to form a
valid word?

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Alex opened 24 presents
Jonah opened 8 presents
Clara opened 1 present

Can you find out how many presents were opened by Candy?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

Decode below rebus
D
N
A
T
S , D