Answer and working out attached, hope this helps
Answer:
x = 40
Step-by-step explanation:
3x + (x+20) = 180
(2x10)+(4x1)+(3x1/10)+(5x1/100)+(7x1/1000)
<span>1/10,1/100,1000 are fractions
Hope I Helped!!!</span>
Answer:
The correct answer is A which is

Step-by-step explanation:
The angle of elevation from the submarine to the boat is
.
This is the angle through which an observer from the submarine will raise the head before seeing the boat.
See diagram in the attachment for illustration.