Answer:
Last Option
Step-by-step explanation:
We have a triangle and we know its three sides.
We want to find one of your anguos. Then we use the cosine theorem.

Where

Now we solve for x from the equation

Answer:
Im either gonna say, the last one or the first. Please dont hate me.
Answer:19
Step-by-step explanation: draw the tanks put 6 fish in each tank until you get all 115 in each tank