How many distinct tripeptides can be made from the two amino acids leucine and histidine?

The right answer is 8 (2^3)

to solve these kind of question, you should use this equation:

solution = number of kinds of elements (aminoacids) ^ the lenght of the sequence (polypeptide).

If they are not numerous you can write those possibilities: (K for lysine and H for histidine).

1. KKK

2. KKH

3. KHK

4. KHH

5. HKK

6. HKH

7. HHK

8. HHH

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

i'm pretty sure it is letter c.) car