__Question 4__

Place these numbers in decreasing order of size.

8^1, 7^2, 6^3, 5^4, 4^5, 3^6, 2^7, 1^8

Which is the highest number?

(Note that 6^3 means 6

^{3}.)

A4 = ___

-=+=-

__Question 5__

32-28-92-16 2-75 !

What does it mean?

A5 = ___

-=o=-

Question 6

Here is a peculiar sequence of numbers:

123456789, 33456789, 6456789, 696789, 691389, ...

What single-digit number is left at the end?

A6 = ___

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