What does this Rebus Picture means ?

What two things can you never eat for breakfast?

There is something which is always coming but never arrives?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

Can you name four days which start with the letter 'T'?

I can be cracked, made, told, and played. What am I?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

What demands an answer, but asks no questions

Find the next number in the series below

21 32 54 87 131 ?