Real numbers

The unit digit of the power of a number repeats every 4 powers. e.g. $2^1 \rightarrow 2, 2^2 \rightarrow 4, 2^3 \rightarrow 8, 2^4 \rightarrow 6, 2^5 \rightarrow 2 ......$ Since 29 divided by 4 has a remainder of 1, it means that $8^29$ has the same unit digit as $8^1$ which is 8.

The pattern is that 8^(1+4x), for any integer x, the number has an 8 as it's units digit. So 29=1+4x and x=7. Since x is a integer, the number has an 8 in its units digit.