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

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

It is an eleven letter word.
The first, second, third and fourth letters form a banquet's name.
The fifth, sixth and seventh letters form a car's name.
The eighth, ninth, tenth and eleventh letters form a mode of transport.

Can you identify what word it is?

Find the value of "?" in the ball picture Riddle below:

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

If 21x = 79x, what is the value of x?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

How is the moon similar to a dollar?

I add 5 to 9 and get 2. The answer is correct, so what am I?