Can anyone tell me a word in the English dictionary which has a silent 'z'?

I am quite hot but become too cold if you remove the first two letters. What am I?

Move four matchsticks to the below square to form three squares?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Given below is simple addition with a defined pattern pattern:
7 + 7 = 2
8 + 8 = 4
8 + 5 = 1
6 + 9 = 3
10 + 11 = 9

Can you analyze the pattern and find out the answer for:

4 + 9 = ?

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

Solve below rebus puzzle?

I always drive my customer away.

Who am I?

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

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?