For your first one it’s definitely 94$
Answer:

Step-by-step explanation:
we have:

we also have:

from (1)(2) => proven
For the answer to the question above, I believe the answer is simply <u><em>8.
</em></u>
2 groups divided into four participants. So all in all people needed is 8.
I hope this helped you. Have a nice day!
<u><em /></u>
I’m not sure about this one I’m sorry I couldn’t help