Answer:
We have that 
Step-by-step explanation:
We have just to replace n=10 on the general equation

Therefore:

Amp is the number in front of sine so its 1/2 aka D :)
Answer:
8.66
Step-by-step explanation:
You can arrange them 16 times
1) aabb
2) aabb
3) bbaa
4) bbaa
5) abab
6) abab
7) abab
8) baba
9) baba
10) abba
11) baba
12) baab
13) baab
14) baab
15) baab
16) abba