How many 10 letter words can you make from the letters A,B,C,D,E,F,G and H?

To determine how many 10-letter words can be made from the letters A, B, C, D, E, F, G, and H, we need to consider the following:

1. Number of letters available: We have 8 distinct letters (A, B, C, D, E, F, G, H).
2. Length of the word: We need to form a 10-letter word.

Since we are allowed to use each letter more than once, this is a problem of permutations with repetition.

For each of the 10 positions in the word, we have 8 choices (one for each letter).

Therefore, the total number of 10-letter words is calculated as: $8^{10}$

Now, let's compute this:

$8^{10} = 8 \times 8 \times 8 \times 8 \times 8 \times 8 \times 8 \times 8 \times 8 \times 8$

$8^{10} = 1073741824$

So, the number of 10-letter words that can be made from the letters A, B, C, D, E, F, G, and H is 1,073,741,824.