Answer: 
Step-by-step explanation:
According to the cosine rule

Here, 
Putting values

So, the ship turns by
north of west
Step-by-step explanation:
To solve this, you either need x or y. So x or y can be the missing values. The most you can do is simply move one of the terms to the other side.
Answer:
7.6 inches to make an acute triangle
Step-by-step explanation:
a^2+b^2=c^2
7^2+3^2=c^2
49+9=c^2
58=c^2
Square root both sides
c=7.6 inches
Answer:
(6,1)
Step-by-step explanation:
you add the x coordinates then divide them by 2
and then add the y coordinates then divide them by 2 also