Answer:
a equals 105°
Step-by-step explanation:
angles in a straight line add up to 180°
a+75=180
a=180-75
a=105°
Answer: 
Step-by-step explanation:
According to the cosine rule

Here, 
Putting values

So, the ship turns by
north of west
Answer:
x=8.6
Step-by-step explanation:
x=8.6
The expanded form would be 100.000 +20.000+0.000+.500+.070+.001