I) -7s^2+28st+21su
II) -8c^2+20cd
6 equals 6*10^0 which os 6*1=6
Answer:
120 words
Step-by-step explanation:
There are only three possible letters, assuming words can be 1, 2, 3 or 4 letters long:
The number of 1 letter words is 3
The number of 2 letter words is 3² = 9
The number of 3 letter words is 3³ = 27
The number of 4 letter words is 3⁴ = 81
The total number of possible words is:

This tribe's language has 120 words.

Step-by-step explanation:
Hope it will help you.
The first one :)
apparently brainly needs 20+ characters so ejsorjxlhelehIwbekzheknf